1. V. I. Arnol'd, "Topological invariants and algebraic functions," Funktsional. Analiz i Ego Prilozhen.,4, No. 2, 1–9 (1970).
2. V. I. Arnol'd, "Classification of unimodal critical points of functions," Funktsional. Analiz i Ego Prilozhen.,7, No. 3, 75–76 (1973).
3. Lê Dũng Tráng, "Les théorémes de Zarisky de type de Lefschetz," Centre de Math. de l'Ecole Polytechnique, Paris (1971).
4. Lê Dũng Tráng, "Une application d'un théoréme d'A'Campo a l'équisingularité," Preprint, Centre de Math. de l'École Polytechnique, Paris (1973).
5. N. A'Campo, "Le nombre de Lefschetz d'une monodromie," Indag. Math. (1973).