LOHWATER, A. J. Some consequences of the theorems of Gross and Iversen. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 315–326, 1976. DOI: 10.5186/aasfm.1976.0221. Disponível em: https://afm.journal.fi/article/view/134300. Acesso em: 13 may. 2024.