E. S. Lakshminarayanan and C. Selvadeepa (2016) “Some Observations of $t^*$ on Mortality Curve at Very Old Age”, International Journal of Mathematics And its Applications, 4(1 - D), pp. 35–40. Available at: https://ijmaa.in/index.php/ijmaa/article/view/614 (Accessed: 22 July 2024).