@book{GroetschelLovaszSchrijver1993, author = {Martin Gr{\"o}tschel and L{\´a}szlo Lov{\´a}sz and Alexander Schrijver}, title = {Geometric Algorithms and Combinatorial Optimization}, edition = {Second corrected edition}, volume = {2}, isbn = {3-540-56740-2, 0-387-56740-2 (U.S.)}, year = {1993}, }