Luitpold Babel Gerhard J. Woeginger Pseudo-Hamiltonian Graphs. 553-567 2000 14 Acta Cybern. 4 http://www.inf.u-szeged.hu/kutatas/actacybernetica/vol14n4/cikk4.xml db/journals/actaC/actaC14.html#BabelW00