Sarita, P. . Bhatia, S. . Kumar, and H. K. Dhingra, “Reliability and Fault Analysis of a Stochastic Model of a Standby System with Cost Depended Repair/Replacement of Substandard Unit and Correlated Life Time”, J. Sci. Res., vol. 14, no. 2, pp. 559–568, May 2022.