1. Klarner DA (1967) Can J Math 19: 851
2. Harary F (1967) In: Harary F (ed) Graph theory and theoretical physics, Academic, London, p 1
3. Palmer EM (1972) In: Alavi Y, Lick DR, White AT (eds) Graph theory and applications, Proceedings of the conference at Western Michigan University, May 10–13, 1972 (Lecture Notes in Mathematics 303); Springer, Berlin Heidelberg New York, p 215
4. Harary F, Palmer EM (1973) Graphical enumeration, Academic, New York
5. Harary F, Palmer EM, Read RC (1975) Discrete Math 11: 371