• Ametisse sai tulevase põlevkivituha töötlustehase ehitusjuhtPõhjarannik2022 / Lk. 3 https://dea.digar.ee/article/pohjarannik/2022/12/17/5.10
• Calcium carbonate crystallization on the basis of waste oil shale ash leachatesVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikISIC 18 : 18th International Symposium on Industrial Crystallization : 13-16 September 2011, Zurich, Switzerland : book of abstracts2011 / p. 501 : ill
• Calcium carbonate precipitation : modelling of reaction kinetics in tubular reactorHautaniemi, Marjaana; Imppola, O.; Solismaa, P.; Kukkamäki, E.; Kallas, Juha; Louhi-Kultanen, MarjattaISIC 18 : 18th International Symposium on Industrial Crystallization : 13-16 September 2011, Zurich, Switzerland : book of abstracts2011 / p. 41-42 : ill
• CO2 mineral trapping : modeling of calcium carbonate precipitation in a semi-batch reactorVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikEnergy procedia2011 / p. 771-778 : ill
• CO2 mineralisation : production of CaCO3-type material in a continuous flow disintegrator-reactorVelts, Olga; Kindsigo, Merit; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikEnergy procedia2014 / p. 5904-5911 : ill https://doi.org/10.1016/j.egypro.2014.11.625 https://www.scopus.com/sourceid/17700156736 https://www.scopus.com/record/display.uri?eid=2-s2.0-84922883005&origin=inward&txGid=031b6c77f1a2c07fdf8c730a5b1da22e https://www.webofscience.com/wos/woscc/full-record/WOS:000361211506011
• Co-utilization of CO2 and oil shale combustion wastes for production of PCC-type materialVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemik12th International Conference on Carbon Dioxide Utilization : ICCDU XII 2013 : June 23-27, 2013, Alexandria, VA, USA, Westin Hotel2013 / p. 230
• Co-utilization of CO2 and waste oil shale ash to produce calcium carbonateVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemik11th International Conference on Carbon Dioxide Utilization (ICCDU XI), June 27-30, 2011, Dijon, France : programm & abstracts2011 / p. P133 : ill
• Crystallization of calcium carbonate on the basis of oil shale waste ash in a continuous flow disintegrator-reactorVelts, Olga; Kindsigo, Merit; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikISIC 19 : 19th International Symposium on Industrial Crystallization : book of abstracts : 16-19 September 2014, Toulouse - France2014 / p. 359-360 : ill
• Eesti põlevkivituhale terendab veel üks rakendus – sellest saab toota magneesiumi [Võrguväljaanne]Pau, Aivarforte.delfi.ee2022 https://forte.delfi.ee/artikkel/120085830/eesti-polevkivituhale-terendab-veel-uks-rakendus-sellest-saab-toota-magneesiumi
• Efforts in oil shale ash indirect carbonation accompanied by PCC-type material formationVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikProceedings of the 4th International Conference on Accelerated Carbonation for Environmental and Materials Engineering : ACEME 2013 : April 9-12, 2013, Leuven, Belgium2013 / p. 341-348 : ill
• Glendonite occurrences in the Tremadocian of Baltica : first Early Palaeozoic evidence of massive Ikaite precipitation at temperate latitudesPopov, Leonid E.; Alvaro, J. Javier; Holmer, Lars E.; Bauert, Heikki; Hints, Olle; Männik, Peep13th International Symposium on the Ordovician System : Novosibirsk, Russia (July 19-22, 2019) : contributions2019 / p. 161-162 http://www.igcp653.org/wp-content/uploads/2019/07/ISOS13Proceedings.pdf
• Modelling continuous process for precipitated calcium carbonate production from oil shale ashTamm, Kadriann; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikGHGT-13 : 13th International Conference on Greenhouse Gas Control Technologies : November 14th-18th, 2016, SwissTech Convention Center - Lausanne, Switzerland : conference programme2016 / p. 67
• Modelling continuous process for precipitated calcium carbonate production from oil shale ashTamm, Kadriann; Kallas, Juha; Kuusik, Rein, keemik; Uibu, MaiEnergy procedia2017 / p. 5409-5416 : ill https://doi.org/10.1016/j.egypro.2017.03.1685 https://www.scopus.com/sourceid/17700156736 https://www.scopus.com/record/display.uri?eid=2-s2.0-85029623263&origin=inward&txGid=1c1f6327ede3d53d1df468a5416293c5 https://www.webofscience.com/wos/woscc/full-record/WOS:000419147305067
• Mägesid liigutav innovatsioonUibu, MaiTrialoog2025 https://trialoog.taltech.ee/magesid-liigutav-innovatsioon/
• Oil shale ash as a source of calcium for calcium carbonate : process feasibility, mechanism and modeling = Põlevkivituhk kaltsiumkarbonaadi toormena : protsessi teostatavus, mehhanism ja modelleerimineVelts, Olga2011
• Oil shale ash hills turn into climate positive raw materials in Narva [Online resource]Elias, Kristonews.err.ee2022 https://news.err.ee/1608802702/oil-shale-ash-hills-turn-into-climate-positive-raw-materials-in-narva
• "Osoon" : tuhamäed võivad kujuneda kliimaneutraalse tööstuse tooraineksElias, Kristonovaator.err.ee2022 https://novaator.err.ee/1608802570/osoon-tuhamaed-voivad-kujuneda-kliimaneutraalse-toostuse-tooraineks
• PCC production from calcium-rich oxy-fuel CFBC ashLoo, Lauri; Konist, Alar; Zevenhoven, Ron30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2017), San Diego, California, USA, 2 - 6 July 20172017 / p. 1672-1681 : ill https://www.etis.ee/File/DownloadPublic/8958054d-0303-4446-be47-7a3374d71625?name=ECOS_Loo%20et%20al-final.pdf&type=application%2Fpdf http://toc.proceedings.com/39394webtoc.pdf
• Physical–mechanical properties and morphology of filled low-density polypropylene: comparative study on calcium carbonate with oil shale and coal ashesKrasnou, Illia; Nadeem, Faisal; Gregor, Andre; Yörük, Can Rüstü; Krumme, AndresJournal of Vinyl and Additive Technology2022 / p. 94-103 : ill https://doi.org/10.1002/vnl.21869 https://www.scopus.com/sourceid/13691 https://www.scopus.com/record/display.uri?eid=2-s2.0-85115837885&origin=inward&txGid=51980ab1119b1d6e355ec8330abd8be2 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20VINYL%20ADDIT%20TECHN&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000700962000001
• Prospects in waste oil shale ash sustainable valorizationVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikWorld Academy of Science, Engineering and Technology2011 / p. 451-455 : ill
• Ragn-Sells loodab põlevkivituha töötlemise demotehase avada aasta pärastkestlikkusuudised.ee2025 https://www.kestlikkusuudised.ee/uudised/2025/01/22/ragn-sells-loodab-polevkivituha-tootlemise-demotehase-avada-aasta-parast
• Ragn-Sells sai riigilt toetuse põlevkivituhast magneesiumi väärindamiseks [Võrguväljaanne]delfi.ee2022 https://arileht.delfi.ee/artikkel/120084546/ragn-sells-sai-riigilt-toetuse-polevkivituhast-magneesiumi-vaarindamiseks
• Riik toetab Ragn-Sellsi põlevkivituha väärindamist 1,7 miljoni euroga [Võrguväljaanne]rohe.geenius.ee2022 https://rohe.geenius.ee/rubriik/uudis/riik-toetab-ragn-sellsi-polevkivituha-vaarindamist-17-miljoni-euroga/
• Synthesis and thermal transformations of Ca, Mg - carbonateapatiteVilbok, Heinrich; Knubovets, Rena; Veiderma, MihkelProceedings of the Estonian Academy of Sciences. Chemistry1992 / 2, p. 45-51
• Synthesis and thermal transformations of Ca, Mg - carbonateapatiteVeiderma, Mihkel; Vilbok, Heinrich; Knubovets, RenaXIIth International Conference on Phosphorus Chemistry : abstracts of posters, Toulouse, France, 19921992 / p. 11-95
• Synthesis and thermal transformations of Ca, Mg-carbonateapatiteVilbok, Heinrich; Knubovets, Rena; Veiderma, MihkelEesti Teaduste Akadeemia Toimetised. Keemia1992 / 2, lk. 45-51: ill
• Synthesis of Mg and Na containing carbonate fluorapatites and their use for removal of Cd2+ and Mn2+ ions from solutionTõnsuaadu, Kaia; Peld, Merike; Veiderma, Mihkel2nd International Symposium on Inorganic Phosphate Materials '96 Nagoya, September 4-6, 1996 : book of abstracts1996 / p. 38 https://www.researchgate.net/publication/286300579_SYNTHESIS_OF_Mg_AND_Na_CONTAINING_CARBONATE-FLUORAPATITES_AND_THEIR_USE_FOR_THE_REMOVAL_OF_Cd2_AND_Mn2_IONS_FROM_SOLUTIONS
• Tallinna Tehnikaülikooli professor: praod täituvad valdavalt kaltsiumkarbonaadi kristallisatsiooni tõttu : [L.-M.Raado kommentaar artiklile "Iseparanev betoon - senisest vastupidavam ja turvalisem?"]Raado, Lembi-MerikeEhitaja2009 / 7/8, lk. 69
• Terendab lahendus tuhamägedele: Ida-Virumaale võib tulla kaltsiumkarbonaadi tehas [Võrguväljaanne]Pau, Aivarforte.delfi.ee2021 https://forte.delfi.ee/artikkel/93134621/terendab-lahendus-tuhamagedele-ida-virumaale-voib-tulla-kaltsiumkarbonaadi-tehas
• Testi tulemused ületasid ootusi : Ida-Virumaa põlevkivituhast saab toota värvirohe.geenius.ee2024 https://rohe.geenius.ee/rubriik/rohetehnoloogia/testi-tulemused-uletasid-ootusi-ida-virumaa-polevkivituhast-saab-toota-varvi/
• Utilization of oil shale ash to prepare PCC : leachibility dynamics and equilibrium in the ash-water systemVelts, Olga; Uibu, Mai; Rudjak, Irina; Kallas, Juha; Kuusik, Rein, keemikEnergy procedia2009 / p. 4843-4850 : ill https://www.sciencedirect.com/science/article/pii/S1876610209009552
• Utilization of oil shale combustion wastes for PCC production : quantifying the kinetics of Ca(OH)₂ and CaSO₄·2H₂O dissolution in aqueous systemsUibu, Mai; Tamm, Kadriann; Velts-Jänes, Olga; Kallaste, Priit; Kuusik, Rein, keemik; Kallas, JuhaFuel processing technology2015 / p. 156-164 : ill https://doi.org/10.1016/j.fuproc.2015.09.010 https://www.scopus.com/sourceid/16315 https://www.scopus.com/record/display.uri?eid=2-s2.0-84941797185&origin=inward&txGid=3015e3cc31122031f6f310c98971e784 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FUEL%20PROCESS%20TECHNOL&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000363354000019
• Waste oil shale ash as a novel source of calcium for precipitated calcium carbonate : carbonation mechanism, modeling, and product characterizationVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikJournal of hazardous materials2011 / p. 139-146 : ill
• В Нарве через год начнут перерабатывать сланцевую золуKalda, Eriksevernojepoberezhje.postimees.ee2025 https://severnojepoberezhje.postimees.ee/8177026/v-narve-cherez-god-nachnut-pererabatyvat-slancevuyu-zolu
• Государство выделит крупнейшему проекту экономики замкнутого цикла 1,7 млн евро [Online resource]rus.delfi.ee2022 https://rus.delfi.ee/statja/95668195/gosudarstvo-vydelit-krupneyshemu-proektu-ekonomiki-zamknutogo-cikla-1-7-mln-evro
• Компания Ragn-Sells начала расширять команду проекта по обогащению сланцевой золы [Online resources]stena.ee2022 https://www.stena.ee/blog/kompaniya-ragn-sells-nachala-rasshiryat-komandu-proekta-po-obogascheniyu-slantsevoj-zoly
• Нарва может стать поставщиком важнейшего для ЕС сырья [Online resources]gorod.ee2022 https://gorod.ee/2022/10/narva-mozhet-stat-postavshchikom-vazhneyshego-dlya-es-syrya/
• Планируемый в Нарве завод займет два-три процента всего мирового рынка чистого карбоната кальция [Online resource]Andrejev, Nikolairus.postimees.ee2022 https://rus.postimees.ee/7454650/planiruemyy-v-narve-zavod-zaymet-dva-tri-procenta-vsego-mirovogo-rynka-chistogo-karbonata-kalciya
• Под Нарвой будет построен демонстрационный завод по обогащению сланцевой золыstena.ee2022 https://www.stena.ee/blog/pod-narvoj-budet-postroen-demonstratsionnyj-zavod-po-obogascheniyu-slantsevoj-zoly
• Уникальный завод замкнутого цикла появится в Нарве [Online resource]gorod.ee2022 https://gorod.ee/2022/02/unikalnyy-zavod-zamknutogo-cikla-poyavitsya-v-narve/