%% -*-BibTeX-*- @Article{GroetschelThomassenWakabayashi1980, author = "Martin Gr{\"o}tschel and Carsten Thomassen and Yoshiko Wakabayashi", title = "Hypotraceable digraphs", journal = "Journal of Graph Theory", volume = "4", pages = "377--381", year = "1980", classmath = "*05C20 05C30 05C35 05C45", language = "English", }