BOUKOUCHA, Rachid. EXPLICIT FORM FOR THE FIRST INTEGRAL AND LIMIT CYCLES OF A CLASS OF PLANAR KOLMOGOROV SYSTEMS. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 55, n. 1 (254), p. 1–11, 2021. DOI: 10.46991/PYSU:A/2021.55.1.01. Disponível em: https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol55_no1_2021_pp001-011. Acesso em: 23 nov. 2024.