“…Bhat and Subba Rao (1987) and Bhat et al (1997) have reviewed this and related aspects. However, the literature on estimation in queuing systems in the post review period has prospered due to contributions from Conti (1999), Rio Insua et al (1998, Armero and Bayarri (1999), Sharma and Kumar (1999), Zheng and Seila (2000), Conesa (1998, 2000), Butler and Huzurbazaar (2000), Huang and Brill (2001), Ausin et al (2004), Mukherjee and Chowdhury (2005), Chu and Ke (2006), Chu and Ke (2007), Ausin et al (2008), Choudhury and Borthakur (2008), Ramirez et al (2008Ramirez et al ( , 2008a, Kiessler and Lund (2009), Jayakrishna Udupa (2009), Xu et al (2011), Srinivas et al (2011), and Chowdhury and Mukherjee (2013.…”