BODIN, N.; ZALGALLER, V. On the concavity of some functions connected with the two-dimensional normal distribution. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 3, p. 389–393, 1967. DOI: 10.15388/LMJ.1967.19978. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19978.. Acesso em: 30 apr. 2024.