FARKAS, I. ATTRACTORS OF SYSTEMS CLOSE TO THE LIENARD’S EQUATION. Periodica Polytechnica Electrical Engineering, [S. l.], v. 26, n. 3-4, p. 241–247, 1982. Disponível em: https://pp.bme.hu/ee/article/view/4760. Acesso em: 18 may. 2024.