S. Munkhtsetseg, N.A.Poklonski, G. Shilagardi, S. Erdenebat, N.M. Lapchuk and A.V. Komich 2022. EPR study of some Mongolian coals. Scientific transaction of the National University of Mongolia. Physics. 15, 309 (Mar. 2022), 5–9. DOI:https://doi.org/10.22353/physics.v15i309.252.