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/

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