Analysis of non-pre-emptive priority retrial queueing system with two-way communication, Bernoulli vacation, collisions, working breakdown, immediate feedback and reneging. - G. Ayyappan; J. Udayageetha; B. Somasundaram (Int. J. Math. Oper. Res., 2020)

Analysis of MAP1I, PH2O/PH1I, PH2O/1 retrial queue with two-way communication, optional service, single vacation, closedown, setup and balking. - G. Ayyappan; G. Archana Alias Gurulakshmi; B. Somasundaram (Int. J. Math. Oper. Res., 2022)