Optimal control for an MX/G/1 queue with two service modes. - Rein D. Nobel; Henk C. Tijms (Eur. J. Oper. Res., 1999)

Optimal control of a queueing system with heterogeneous servers and setup costs. - Rein D. Nobel; Henk C. Tijms (IEEE Trans. Autom. Control., 2000)

A discrete-time retrial queueing model with one server. - Rein D. Nobel; Pilar Moreno (Eur. J. Oper. Res., 2008)