HALLBERG, F. The Logarithmic Derivate of the Gamma-Function. The Journal of the Indian Mathematical Society, [S. l.], v. 9, n. 6, p. 226–228, 1917. DOI: 10.18311/jims/1917/17669. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17669. Acesso em: 1 may. 2024.