Grigoryan, Karen K. “MOMENTUM OF AN ELECTROMAGNETIC WAVE IN TIME-VARYING DIELECTRIC MEDIA”. Proceedings of the YSU A: Physical and Mathematical Sciences 55, no. 2 (255) (August 30, 2021): 148–152. Accessed April 29, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol55_no2_2021_pp148-152.