IRING, R.; REUSS, E.; YANG, C.S. SOME REFLECTIONS ON THE RELAXATION OF BIHARMONlC DIFFERENTIAL EQUATIONS IN POLAR COORDINATES Periodica Polytechnica Mechanical Engineering, [S. l.], v. 5, n. 4, p. 335–344, 1961. Disponível em: https://pp.bme.hu/me/article/view/6376. Acesso em: 3 jul. 2024.