DRASIN, D. A note on functions with deficiency sum two. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 59–66, 1976. DOI: 10.5186/aasfm.1976.0208. Disponível em: https://afm.journal.fi/article/view/134282. Acesso em: 16 apr. 2025.