TEPOYAN, L.P. DEGENERATE FIRST ORDER DIFFERENTIAL-OPERATOR EQUATIONS. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 53, n. 3 (250), p. 163–169, 2019. DOI: 10.46991/PYSU:A/2019.53.3.163. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol53_no3_2019_pp163-169. Acesso em: 11 may. 2024.