@article{RO_1978__12_1_85_0,
     author = {Gopalan, M. N. and Venkatachalam, P.},
     title = {Availability and reliability of a 2-unit 2-server system subject to preventive maintenance and repair},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {85--92},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {1},
     year = {1978},
     mrnumber = {469233},
     zbl = {0371.90047},
     language = {en},
     url = {http://archive.numdam.org/item/RO_1978__12_1_85_0/}
}