TY - JOUR AU - Kovaleva, Sofia AU - Spieksma, Frits C. R. TI - Primal-dual approximation algorithms for a packing-covering pair of problems JO - RAIRO - Operations Research - Recherche Opérationnelle PY - 2002 SP - 53 EP - 71 VL - 36 IS - 1 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/ro:2002005/ DO - 10.1051/ro:2002005 LA - en ID - RO_2002__36_1_53_0 ER -