Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHow hard is it to determine if a graph has a 2-role assignment?AuthorsRoberts, Fred S.; Sheng, LiPublicationNetworks, 2001, Vol 37, Issue 2, p67ISSN0028-3045Publication typeArticleDOI10.1002/1097-0037(200103)37:2<67::AID-NET1>3.0.CO;2-9