no. V3
The busy period of a repairman for redundant repairable systems
Revue française d'automatique, informatique, recherche opérationnelle. Recherche opérationnelle, Tome 9 (1975) no. V3, pp. 69-73. 
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     title = {The busy period of a repairman for redundant repairable systems},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Recherche op\'erationnelle},
     pages = {69--73},
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     volume = {9},
     number = {V3},
     year = {1975},
     mrnumber = {403616},
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Nakagawa, Toshio; Osaki, Shunji. The busy period of a repairman for redundant repairable systems. Revue française d'automatique, informatique, recherche opérationnelle. Recherche opérationnelle, Tome 9 (1975) no. V3, pp. 69-73. http://www.numdam.org/item/RO_1975__9_3_69_0/

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[7] E. J. Vanderperre, The busy period of a repairman attending a (n + 1) unit parallel system, R.A.I.R.O., 7e année, V-l, 1973, p. 124-126. | Numdam | MR | Zbl