GRIPENBERG, G. On the asymptotic behaviour of nonlinear contraction semigroups. MATHEMATICA SCANDINAVICA, [S. l.], v. 44, p. 385–397, 1979. DOI: 10.7146/math.scand.a-11819. Disponível em: https://www.mscand.dk/article/view/11819. Acesso em: 4 may. 2024.