2023 A Counterexample to Box-Half-Integrality of the Intersection of Crossing Submodular Flow Systems Michel X. Goemans, and Yuchong Pan 2023 Bib PDF @unpublished{goemans2023counterexample, title = {A Counterexample to Box-Half-Integrality of the Intersection of Crossing Submodular Flow Systems}, author = {Goemans, Michel X. and Pan, Yuchong}, year = {2023}, }