Changes in phosphorite composition and properties during mechanical activationPetkova, Vilma; Tõnsuaadu, Kaia; Kaljuvee, Tiit; Traksmaa, RainerThe Third International Conference on the Valorization of Phosphates and Phosphorus Compounds : COVA Phos 3 : Marrakech, Morocco, March 18th-20th, 2009 : abstracts2009 / p. 186-188

Changes in phosphorite composition and properties during mechanical activationTõnsuaadu, Kaia; Kaljuvee, Tiit; Petkova, Vilma; Traksmaa, Rainer; Kirsimäe, KalleResearchers' Network on Phosphates : The Third International Conference on the Valorization of Phosphates and Phosphorus Compounds : COVAPHOS III : Marrakech, Morocco, March 18th-20th, 2009 : proceedings2009 / p. 15-21

Changes in the thermal behaviour of phosphorite sample from Toolse deposit (Estonia) along the drill-coreKaljuvee, Tiit; Tõnsuaadu, Kaia; Kallaste, Toivo; Hints, Rutt; Kivimäe, Eliise-Koidula; Petkova, Vilma; Trikkel, Andres7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7) : book of abstracts2023 / p. 69

Characterization and changes in the thermal behavior of the phosphorite sample from Toolse deposit (Estonia) along the drill-coreKaljuvee, Tiit; Tõnsuaadu, Kaia; Kallaste, Toivo; Graul, Sophie; Hints, Rutt; Kivimäe, Eliise-Koidula; Petkova, Vilma; Trikkel, AndresJournal of thermal analysis and calorimetry2024 / p. 12651 - 12664 https://doi.org/10.1007/s10973-024-13655-x Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Comparative study of the thermal behavior of mechanoactivated natural carbonate substituted apatites from Africa (Tunisia), Europe (Bulgaria, Estonia), and Asia (Uzbekistan)Petkova, Vilma; Kaljuvee, Tiit; Tõnsuaadu, Kaia; Serafimova, E.; Dombalova, I.; Pelovski, Y.ESTAC10 : 10th European Symposium on Thermal Analysis and Calorimetry : August 22-27, 2010, Rotterdam, The Netherland : abstract book2010 / p. 189

Impact of high energy milled activation on the thermal properties of Bulgarian and Estonian natural apatitesPetkova, Vilma; Kostova, Bilyana; Serafimova, Ekaterina; Kaljuvee, Tiit; Tõnsuaadu, Kaia; Pelovski, Yoncho2nd Journal of Thermal Analysis and Calorimetry Conference, Budapest, June    18–21, 2019 : book of abstracts2019 / p. 480-481 https://jtac-jtacc.akcongress.com/

Impact of mechanical activation on physical and chemical properties of phosphorite concentratesTõnsuaadu, Kaia; Kaljuvee, Tiit; Petkova, Vilma; Traksmaa, Rainer; Bender, Villem; Kirsimäe, KalleInternational journal of mineral processing2011 / p. 104-109

Influence of SiO2 on the thermal behavior of high-energy activated natural phosphoritesPetkova, Vilma; Kostova, Bilyana; Kadiyski, Milen; Kaljuvee, Tiit12th Conference on Calorimetry and Thermal Analysis of Polish Society of Calorimetry and Thermal Analysis and 5th Joint Czech-Hungarian-Polish-Slovakian Thermoanalytical Conference : Book of Abstracts2015 / 218-220

Microstructural and thermal investigations of natural fluorapatite vialong time tribochemical activationPetkova, Vilma; Mihaylova, K.; Serafimova, Ekaterina; Tzvetanova, Y.; Kaljuvee, Tiit; Tõnsuaadu, KaiaJTACC+V4 2025 : 4th Journal of Thermal Analysis and Calorimetry Conference &10th V4 (Joint Czech-Hungarian-Polish-Slovak) Thermoanalytical Conference : Book of Abstracts2025 / p. 428-429 https://static.akcongress.com/downloads/jtacc/jtacc2025/jtacc2025-boa.pdf

Phase and structural investigations of the content of natural radionuclides in rock and inorganic building materialsSerafimova, Ekaterina; Petkova, Vilma; Kaljuvee, TiitIOP conference series : materials science and engineering2023 / 8 p. : ill https://doi.org/10.1088/1757-899x/1264/1/012003

Powder XRD microstructural analysis of thermally treated synthetic fluor-hydroxylapatiteKostov-Kytin, V.V.; Petkova, Vilma; Kaljuvee, TiitBulgarian chemical communications2017 / p. 59–70 : ill http://www.bcc.bas.bg/

TG-FTIR/MS analysis of thermal and kinetic characteristics of some coal samplesKaljuvee, Tiit; Keelman, Merli; Trikkel, Andres; Petkova, VilmaICTAC 15 - 15th International Congress on Thermal Analysis and Calorimetry : August 20-24, 2012, Osaka2012 https://www.researchgate.net/publication/257616213_TG-FTIRMS_analysis_of_thermal_and_kinetic_characteristics_of_some_coal_samples

TG-FTIR-/MS analysis of thermal and kinetic characteristics of some coal samplesKaljuvee, Tiit; Keelman, Merli; Trikkel, Andres; Petkova, VilmaJournal of thermal analysis and calorimetry2013 / p. 1063-1071 : ill https://doi.org/10.1007/s10973-013-2957-y Journal metrics at Scopus Article at Scopus journal metrics at WOS Article at WOS

Thermal and kinetic characteristics of some oil shale samplesKaljuvee, Tiit; Kuusik, Rein, keemik; Petkova, VilmaThermophysics and mass transfer in materials science and construction2015 / p. 67-74 http://dx.doi.org/10.4028/www.scientific.net/AMR.1126.67

Thermal behaviour of Estonian phosphorites from different depositsKaljuvee, Tiit; Tõnsuaadu, Kaia; Traksmaa, Rainer; Einard, Marve; Jefimova, Jekaterina; Petkova, Vilma2nd Journal of Thermal Analysis and Calorimetry Conference, Budapest, June    18–21, 2019 : book of abstracts2019 / p. 134-135 https://jtac-jtacc.akcongress.com/

Thermal behaviour of Estonian phosphorites from different depositsKaljuvee, Tiit; Tõnsuaadu, Kaia; Traksmaa, Rainer; Einard, Marve; Jefimova, Jekaterina; Petkova, VilmaJournal of thermal analysis and calorimetry2020 / p. 437-449 https://doi.org/10.1007/s10973-019-09056-0 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Thermochemical characterization of chicken litter and peat as a source for energy recoveryPetkova, Vilma; Serafimova, Ekaterina; Kaljuvee, Tiit; Pelovsky, YonchoJournal of thermal analysis and calorimetry2013 / p. 683-692 : ill https://doi.org/10.1007/s10973-012-2771-y Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Thermochemical investigations of natural phosphate with ammonium sulphate additivePetkova, Vilma; Pelovski, Y.; Dombalov, I.; Tõnsuaadu, KaiaJournal of thermal analysis and calorimetry2005 / p. 701-708