Тлеукенов, С., Балабеков, К. and Жалгасбекова, З. (2022) “Group velocity and flow of electromagnetic energy in rhombic crystals”, BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. PHYSICS. ASTRONOMY SERIES, 126(1), pp. 90–107. doi: 10.32523/2616-6836-2019-126-1-90-107.