Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Mathematische Besliskunde

Tijms, H. (1975). A note on the optimality of a switch-over policy for the M/G/1 queue with variable service rate. In Stichting Mathematisch Centrum. Mathematische Besliskunde (BN 25/75). Stichting Mathematisch Centrum.