no. 1
Availability and reliability of a 2-unit 2-server system subject to preventive maintenance and repair
RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 1, pp. 85-92. 
@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://www.numdam.org/item/RO_1978__12_1_85_0/}
}
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Gopalan, M. N.; Venkatachalam, P. Availability and reliability of a 2-unit 2-server system subject to preventive maintenance and repair. RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 1, pp. 85-92. http://www.numdam.org/item/RO_1978__12_1_85_0/

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2. M. N. Gopalan and C. A. D'Souza, Probabilistic analysis ofa two-Unit System with a Single Service Facility for Preventive Maintenance and Repair, Opns. Res., 23, 1975, p. 173-177. | MR | Zbl

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