1. Corneil, D.G., Mathon, R.A. (eds.): Geometry and Combinatorics: Selected Works of J. J. Seidel. Academic Press, London (1991)
2. Ehrenfeucht, A., Hage, J., Harju, T., Rozenberg, G.: Pancyclicity in switching classes (submitted)
3. Lecture Notes in Computer Science;A. Ehrenfeucht,1993
4. Ehrenfeucht, A., Rozenberg, G.: Dynamic labeled 2-structures. Mathematical Structures in Computer Science 4, 433–455 (1994)
5. Garey, M.R., Johnson, D.S.: Computers and Intractability: A Guide to the Theory of NP-Completeness. Freeman, New York (1979)