@article {IOPORT.00092045,
    author       = {Noh, Jangkab and Kang, Sung-Jin and Feldman, Richard M.},
    title        = {A control policy for replacement involving two machines and one repairman.},
    year         = {1992},
    journal      = {European Journal of Operational Research},
    volume       = {56},
    number       = {3},
    issn         = {0377-2217},
    pages        = {413-422},
    publisher    = {Elsevier Science B.V.(North-Holland), Amsterdam},
    doi          = {10.1016/0377-2217(92)90324-3},
    abstract     = {Summary: An optimal control policy for replacement involving two machines and one repairman is developed by investigating a class of age replacement policies in the context of controlling a G/M/1 queueing system with a finite calling population. The control policy imposed on the system is an age-dependent control policy. The control limit is operational only when the repairman is idle; that is, if both machines are working, as soon as a machine reaches the age $t\sp*$ it is taken out of service for replacement.},
    identifier   = {00092045},
}