G, M., R, B., B, O., D, O., D, N., L, S. and /n, T. 2022. Optical identification of few layers of MoS₂, MoSₑ₂, WS₂ and WSₑ₂. Scientific transaction of the National University of Mongolia. Physics. 29, 518 (Oct. 2022), 32–34. DOI:https://doi.org/10.22353/physics.v29i518.1196.