1. Limits of zeros of recursively defined families of polynomials;Beraha;Studies in Foundations and Combinatorics, Advances in Mathematics, Supplementary Studies,1978
2. A matrix method for chromatic polynomials;Biggs;J. Combin. Theory Ser. B,2001
3. N.L. Biggs, A matrix method for chromatic polynomials—II, CDAM Research Report, LSE-CDAM-2000-4, April, 2000
4. Chromatic polynomials for twisted bracelets;Biggs;Bull. London Math. Soc.,2002
5. Equimodular curves;Biggs;Discrete Math.,2002