GUPTA, L.; KUNDU, S. Functions that preserve certain classes of sequences and locally Lipschitz functions. Annales Fennici Mathematici, [S. l.], v. 45, n. 2, p. 699–722, 2020. DOI: 10.5186/aasfm.2020.4542. Disponível em: https://afm.journal.fi/article/view/135878. Acesso em: 20 may. 2024.