MARINESCU, Dan Ştefan; MONEA, Mihai. An extension of a Ger’s result. Annales Mathematicae Silesianae, [S. l.], v. 32, p. 263–274, 2017. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/13925. Acesso em: 7 may. 2025.