Gerhard J. Woeginger Jiri Sgall The complexity of coloring graphs without long induced paths. 107- 2001 15 Acta Cybern. 1 http://www.inf.u-szeged.hu/kutatas/actacybernetica/vol15n1/cikk8.xml db/journals/actaC/actaC15.html#WoegingerS01