Unique estimation of mortality rates in Gompertz survival model parameters. - E. S. Lakshminarayanan; M. Pitchaimani (Appl. Math. Lett., 2003)

Existence of Gompertz parameters and its asymptotic formulae for a large population. - E. S. Lakshminarayanan; M. Pitchaimani (Appl. Math. Lett., 2004)

Existence of a critical Gompertz parameter and its asymptotic expression. - E. S. Lakshminarayanan; M. Pitchaimani (Comput. Math. Appl., 2008)

Existence and estimation of critical negative Gompertz parameter. - E. S. Lakshminarayanan; M. Pitchaimani (Comput. Math. Appl., 2008)