Mieczyslaw Borowiecki Anna Fiedorowicz Katarzyna Jesse-Józefczyk Elzbieta Sidorowicz Acyclic colourings of graphs with bounded degree. 59-74 2010 12 Discrete Mathematics & Theoretical Computer Science 1 http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/1013 db/journals/dmtcs/dmtcs12.html#BorowieckiFJS10