Alusuuringud on aluseks edasisele tööleRiisalu, HellaAastaraamat 2020 : TalTech Virumaa Kolledž2021 / lk. 80 : fot https://www.ester.ee/record=b2666429*est http://data.vk.edu.ee/aastaraamat20/

Application of diffuse reflectance spectroscopy for quick laboratory assessment of Estonian oil shale qualityTufail, Iram; Paris, Peeter; Jõgi, Indrek; Riisalu, HellaProceedings of the Estonian Academy of Sciences2020 / p. 134-142 : ill https://doi.org/10.3176/proc.2020.2.04 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Determination of heating value of Estonian oil shale by laser-induced breakdown spectroscopyAints, Mart; Paris, Peeter; Laan, Matti; Piip, Kaarel; Riisalu, Hella; Tufail, IramJournal of spectroscopy2018 / 10 p. : ill https://doi.org/10.1155/2018/4605925 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Determination of the calorific value and moisture content of crushed oil shale by LIBSAints, Märt; Paris, Peeter; Tufail, Iram; Jõgi, Indrek; Aosaar, Hardi; Riisalu, Hella; Laan, MattiOil shale2018 / p. 339-355 : ill https://doi.org/10.3176/oil.2018.4.04 http://www.kirj.ee/public/oilshale_pdf/2018/issue_4/OS-2018-4-339-355.pdf Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Diesel fuel oxidation in storageJärviste, Raul; Muoni, Rein; Soone, Jüri; Riisalu, Hella; Zaidentsal, AlekseiKhimiya tverdogo topliva2008 / p. 123-127

Environmentally sustainable use of the energy and chemical potential of oil shaleSoone, Jüri; Riisalu, Hella; Kekiševa, Ljudmilla; Doilov, SvjatoslavOil shale conference "Recent Trends in Oil Shale : Research and Applications" : Amman, Jordan, November 7-9, 20062006 / ? p

Hella Riisalu: kuhu paigutada plastjäätmetes peituv liigne süsinik? Bioreaktorisse, nõudmiseni!Riisalu, Hellaaripaev.ee2023 Hella Riisalu: kuhu paigutada plastjäätmetes peituv liigne süsinik? Bioreaktorisse, nõudmiseni!

Investigations into methods of purification fom nitrogen compounds of phenolic waters of the Kiviter processKekiševa, Ljudmilla; Grigorjeva, Larissa; Ostroukhov, N.; Petrovich, N.; Riisalu, Hella; Soone, JüriInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 85 http://www.ester.ee/record=b4775098*est

Plastijäätmete ümbertöötlemine pürolüüsiprotsessis annab põlevkivitööstusele uue mõõtmeRiisalu, HellaTööstusEST2022 / lk. 48-50 : ill http://www.ester.ee/record=b4481084*est https://toostusest.ee/uudis/2022/12/16/plastijaatmete-umbertootlemine-puroluusiprotsessis-annab-polevkivitoostusele-uue-mootme/

Regionaalse kõrghariduse tugevus : Tallinna Tehnikaülikooli Virumaa kolledž tähistab täna oma 20. sünnipäevaRoosileht, Mare; Niidu, Allan; Riisalu, HellaPostimees2020 / Lk. 14-15 : ill https://leht.postimees.ee/7062385/mare-roosileht-allan-niidu-ja-hella-riisalu-regionaalse-korghariduse-uued-voimalused-ida-virumaal https://dea.digar.ee/article/postimees/2020/09/15/12.11

Standardization by analyses of oil shale and its productsRiisalu, Hella; Pihl, Olga; Nuut, AnuInternational Symposium "Oil shale 100 years" : Estonia, Sept. 20-23, 2016 : [abstracts]2016 / p. 48

Studies of oil shale properties variation in El Lajjun (Jordan) boreholeRiisalu, Hella; Anijalg, Andres; Doilov, Svjatoslav; Kekiševa, Ljudmilla; Muoni, Rein; Soone, JüriInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 99-100 http://www.ester.ee/record=b4775098*est

The compasion of Estonian oil shale thermal treatment process by BAT criteriaSoone, Jüri; Riisalu, Hella; Doilov, Svjatoslav26th Oil Shale Symposium : USA, October 16-18, 2006 : abstracts2006 / ? p

The influence of phenols and other compounds on chemical oxygen demand (COD) of phenolic waters from the Kiviter processKekiševa, Ljudmilla; Smirnov, I.; Ostroukhov, N.; Petrovich, N.; Sitnik, Viktor; Riisalu, Hella; Soone, JüriOil shale2007 / 4, p. 573-581 : ill https://artiklid.elnet.ee/record=b2376564*est

Thermogravimetric analysis of polymer waste products and their mixtures with oil shaleRiisalu, Hella; Hruškova, Marta; Pihl, OlgaInternational IX Oil Shale Conference 2017 "Oil Shale Industry in Circular Economy" : 15th-16th November 2017, [Jõhvi], Ida-Viru County, Estonia : summary2017 / p. 35 : ill http://www.ester.ee/record=b4751282*est

Изменение свойств дизельного топлива при его храненииMuoni, Rein; Järviste, Raul; Soone, Jüri; Riisalu, HellaХимия твердого топлива2007 / 3, с. 71-76

Сульфидирование концентратов 5-метилрезорцина элементной серойKekiševa, Ljudmilla; Grigorjeva, Larissa; Soone, Jüri; Riisalu, HellaХимия твердого топлива2007 / 4, с. 9-12

Сульфидирование суммарных сланцевых водорастворимых фенолов элементной серойKekiševa, Ljudmilla; Grigorjeva, Larissa; Soone, Jüri; Riisalu, HellaХимия твердого топлива2007 / 4, с. 13-17