FRYDA, Jan. Quasibilinear functionals. Annales Mathematicae Silesianae, [S. l.], v. 6, p. 65–83, 1992. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14268. Acesso em: 7 may. 2025.