TY - JOUR A1 - Balas, Egon A1 - Stephan, RĂ¼diger T1 - On the cycle polytope of a directed graph and its relaxations JF - Networks Y1 - 2009 U6 - https://doi.org/10.1002/net.20303 VL - 54 IS - 1 SP - 47 EP - 55 ER -