VIET HUNG, Nguyen. STUDY OF THE EXISTENCE AND STABILITY OF SPATIAL SOLITON BEAMS IN HIGHER-ORDER NONLINEAR OPTICAL FIBERS WITH GAIN AND LOSS. Journal of Science Natural Science, [S. l.], v. 71, n. 3, p. 53–65, 2026. DOI: 10.18173/2354-1059.2026-0032. Disponível em: https://hnuejs.edu.vn/ns/article/view/1601. Acesso em: 17 oct. 2026.