COOK, R. J. Chebyshev Functions and Inclusion-Exclusion. The Journal of the Indian Mathematical Society, [S. l.], v. 57, n. 1-4, p. 109–116, 1991. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/21920. Acesso em: 8 may. 2024.