1. A. Andreotti, T. Frankel, The second Lefschetz theorem on hyperplane sections, in: Global Analysis, Papers in Honor of K. Kodaira, Princeton University Press, Princeton, NJ, 1969, pp.1–20.
2. Local homological properties of analytic sets;Burghelea;Manuscripta Math.,1972
3. Topologie du complémentaire d'un ensemble algébrique projectif;Chéniot;L'Enseign. Math.,1991
4. Vanishing cycles in a pencil of hyperplane sections of a non-singular quasi-projective variety;Chéniot;Proc. London Math. Soc. (3),1996
5. D. Chéniot, A. Libgober, Zariski-van Kampen theorem for higher homotopy groups, math.AG/0203019.