SURYANARAYANA, D.; SITA RAMA CHANDRA RAO, R. The Number of Bi-Unitary Divisors of an Integer-II. The Journal of the Indian Mathematical Society, [S. l.], v. 39, n. 1-4, p. 261–280, 1975. Disponível em: https://informaticsjournals.co.in/index.php/jims/article/view/16651. Acesso em: 7 nov. 2024.