1. S. Arnborg and A. Proskurowski, Linear time algorithms for NP-hard problems restricted to partial k-trees, Discrete Applied Mathematics 23 (1989), 11–24.
2. F. Cheah, private communication.
3. D.G. Corneil and P. A. Kamula, Extensions of permutation and interval graphs, Proceedings 18th Southeastern Conference on Combinatorics, Graph Theory and Computing (1987), 267–276.
4. D.G. Corneil, H. Lerchs, L. Stewart Burlingham, Complement reducible graphs, Discrete. Applied Mathematics 3 (1981), 163–174.
5. D. G. Corneil, S. Olariu, and L. Stewart, Asteroidal triple-free graphs, Department of Computer Science, University of Toronto, Technical Report 262/92, June 1992.