no. 2
Optimum age replacement policy with two failure modes
RAIRO. Operations research, Tome 13 (1979) no. 2, pp. 205-208 
@article{RO_1979__13_2_205_0,
     author = {Kaio, Naoto and Osaki, Shunji},
     title = {Optimum age replacement policy with two failure modes},
     journal = {RAIRO. Operations research},
     pages = {205--208},
     year = {1979},
     publisher = {EDP-Sciences},
     volume = {13},
     number = {2},
     mrnumber = {535208},
     zbl = {0397.90042},
     language = {en},
     url = {https://www.numdam.org/item/RO_1979__13_2_205_0/}
}
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Kaio, Naoto; Osaki, Shunji. Optimum age replacement policy with two failure modes. RAIRO. Operations research, Tome 13 (1979) no. 2, pp. 205-208. https://www.numdam.org/item/RO_1979__13_2_205_0/

1. R. E. Barlow and F. Proschan, Mathematical Theory of Reliability, Wiley, New York, 1965. | Zbl | MR

2. B. Fox, Age Replacement with Discounting, Oper. Res., Vol. 14, 1966, p. 533-537. | Zbl

3. S. Osaki and T. Nakagawa, A Note on Age Replacement, I.E.E.E. Trans. Rel., Vol. R-24, 1975, p. 92-94.