SIMON, Alice; VOLKMANN, Peter. Perturbations de fonctions additives. Annales Mathematicae Silesianae, [S. l.], v. 11, p. 21–27, 1997. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14180. Acesso em: 7 may. 2025.