KUO, Chung-Cheng. Local C-semigroups and complete second order abstract Cauchy problems. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 61, n. 2, p. 221–237, 2016. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5554. Acesso em: 10 feb. 2025.