KÜHNAU, R. Zu den Grunskyschen Koeffizientenbedingungen. Annales Fennici Mathematici, [S. l.], v. 6, n. 1, p. 125–130, 1981. DOI: 10.5186/aasfm.1981.0608. Disponível em: https://afm.journal.fi/article/view/134403. Acesso em: 25 nov. 2024.