%% -*-BibTeX-*- @Article{GroetschelWakabayashi1981b, author = "Martin Gr{\"o}tschel and Yoshiko Wakabayashi", title = "On the structure of the monotone asymmetric travelling salesman polytope {II}: Hypotraceable facets", journal = "Mathematical Programming Study", volume = "14", pages = "77--97", year = "1981", classmath = "*90C10 52Bxx 05C35 05C20 05C45", language = "English", }