1. A new method in the combinatorics of the topological expansion;Bessis;Commun. Math Phys.,1979
2. Quantum field theory techniques in graphical enumeration;Bessis;Adv. Appl. Mech.,1980
3. Orthogonal polynomials and their derivatives, I;Bonan;J.~Approx. Theory,1984
4. Functional Analysis and Numerical Mathematics;Collatz,1966
5. On the coefficients in the recursion formulae of orthogonal polynomials;Freud;Proc. Roy. Irish Acad., Sect. A (I),1976