@article{RO_2002__36_1_53_0,
     author = {Kovaleva, Sofia and Spieksma, Frits C. R.},
     title = {Primal-dual approximation algorithms for a packing-covering pair of problems},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {53--71},
     publisher = {EDP-Sciences},
     volume = {36},
     number = {1},
     year = {2002},
     doi = {10.1051/ro:2002005},
     mrnumber = {1920379},
     zbl = {1027.90107},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro:2002005/}
}