NAKAI, M.; SARIO, L. A nonexistence test for biharmonic Green’s functions of clamped bodies. MATHEMATICA SCANDINAVICA, [S. l.], v. 40, p. 151–160, 1977. DOI: 10.7146/math.scand.a-11684. Disponível em: https://www.mscand.dk/article/view/11684. Acesso em: 28 apr. 2024.