MOLNÁR-SÁSKA, G. GENERALIZATION OF A THEOREM BY P. HARTMAN AND A. WINTNER Periodica Polytechnica Mechanical Engineering, [S. l.], v. 21, n. 2, p. 153–158, 1977. Disponível em: https://pp.bme.hu/me/article/view/5910. Acesso em: 3 jul. 2024.