E. S. LAKSHMINARAYANAN; C. SELVADEEPA. Some Observations of $t^*$ on Mortality Curve at Very Old Age. International Journal of Mathematics And its Applications, [S. l.], v. 4, n. 1 - D, p. 35–40, 2016. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/614. Acesso em: 17 may. 2024.