Тлеукенов, С., Балабеков, К., & 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), 90–107. https://doi.org/10.32523/2616-6836-2019-126-1-90-107