GRIPENBERG, Gustaf. 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://tidsskrift.dk/math/article/view/11819. Acesso em: 13 aug. 2026.