ILEA V. Some properties of solutions to a planar system of nonlinear differential equations. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2018 Jun. 30 [cited 2025 Feb. 5];63(2):225–234. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2067