Anh, Nguyen Tuan, Nguyen Huy Bang, and Doai Van Le. “Giant Cross-Kerr Nonlinearity in a Four-Level Y-Type Atomic System”. Photonics Letters of Poland 13, no. 3 (September 30, 2021): 52–54. Accessed November 22, 2024. http://photonics.pl/PLP/index.php/letters/article/view/13-18.