TY - JOUR A1 - Grötschel, Martin A1 - Wakabayashi, Yoshiko T1 - Hypohamiltonian digraphs T2 - Methods of Operations Research Y1 - 1980 UR - https://opus4.kobv.de/opus4-zib/frontdoor/index/index/docId/3015 VL - 36 SP - 99 EP - 119 ER -