@article{RO_2002__36_3_227_0,
     author = {Qian, Cunhua and Pan, Yu and Nakagawa, Toshio},
     title = {Optimal policies for a database system with two backup schemes},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {227--235},
     publisher = {EDP-Sciences},
     volume = {36},
     number = {3},
     year = {2002},
     doi = {10.1051/ro:2003004},
     mrnumber = {1988278},
     zbl = {1062.90020},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro:2003004/}
}