SURYANARAYANA, D. Extensions of Dedekind’s $\psi$-Function. MATHEMATICA SCANDINAVICA, [S. l.], v. 26, p. 107–118, 1970. DOI: 10.7146/math.scand.a-10970. Disponível em: https://www.mscand.dk/article/view/10970. Acesso em: 4 may. 2024.