[1]
R. Boukoucha, “EXPLICIT FORM FOR THE FIRST INTEGRAL AND LIMIT CYCLES OF A CLASS OF PLANAR KOLMOGOROV SYSTEMS”, Proc. YSU A: Phys. Math. Sci., vol. 55, no. 1 (254), pp. 1–11, May 2021, doi: 10.46991/PYSU:A/2021.55.1.01.