TY - JOUR AU - I. L. Vasiliev AU - A. V. Ushakov TI - Lagrangian relaxations for the nonlinear $p$-median problem JO - The Bulletin of Irkutsk State University. Series Mathematics PY - 2011 SP - 45 EP - 59 VL - 4 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IIGUM_2011_4_2_a3/ LA - ru ID - IIGUM_2011_4_2_a3 ER -