GRIPENBERG, Gustaf. On the asymptotic behaviour of nonlinear contraction semigroups. Mathematica Scandinavica, Berkeley, CA, United States, v. 44, p. 385–397, 1979. DOI: 10.7146/math.scand.a-11819. Disponível em: https://journals.msp.org/mscand/article/view/1829. Acesso em: 25 jul. 2026.