ABDEL KARIM , Rahmi Ibrahim; FARKAS, Miklós. ON CONTROLLABLY PERIODIC PERTURBATIONS OF LIÉNARD’S EQUATION Periodica Polytechnica Electrical Engineering, [S. l.], v. 16, n. 1, p. 41–45, 1972. Disponível em: https://pp.bme.hu/ee/article/view/5026. Acesso em: 11 may. 2024.