“…Infinite-source models are treated, e.g., by Ajmone Marsan et al (2001), Artalejo (2010), Do (2010a), Do (2010b), Do et al (2013), and Tran-Gia and Mandjes (1997). Finite-source retrial queues are discussed, e.g., by Artalejo and Lopez-Herrero (2012), Almási et al (2005), Gharbi and Charabi (2012), Kulkarni and Liang (1997), Wüchner et al (2009), Zhang and Wang (2012), Gharbi and Dutheillet (2011), Yang and Templeton (1987), Wang et al (2011) and Zhang and Wang (2013). On the one hand, the assumption of the number of infinite sources covers general modeling opportunities and may lead to some efficient algorithms (Ajmone Marsan et al, 2001;Do, 2010aDo, , 2010bDo and Chakka, 2010;Do et al, 2013;Tran-Gia and Mandjes, 1997) for the performance evaluation of systems.…”