Gérard Cornuéjols Regina Urbaniak Robert Weismantel Laurence A. Wolsey Decomposition of Integer Programs and of Generating Sets. 92-102 1997 conf/esa/1997 ESA db/conf/esa/esa97.html#CornuejolsUWW97 http://dx.doi.org/10.1007/3-540-63397-9_8