1. Canonical labelling of graphs;Babai,1983
2. Finding contractions and induced minors in chordal graphs via disjoint paths;Belmonte,2011
3. Edge contractions in subclasses of chordal graphs;Belmonte,2011
4. Graph classes: a survey;Brandstädt;SIAM Monographs on Discrete Mathematics and Applications,1999
5. Contractibility and NP-completeness;Brouwer;Journal of Graph Theory,1987