1. Artin, E.: Theory of braids. Ann. Math.48, 101?126 (1947)
2. Magnus, W., Karras, A., Solitar, D.: Combinatorial Group Theory. New York: Interscience Publishers 1986
3. Miyaoka, Y.: Algebraic surfaces with positive indices. In: Classification of Algebraic and Analytic Manifolds. Boston: Birkhäuser 1982
4. Moishezon, B.: Stable branch curves and braid monodromies. Lect. Notes in Math., vol. 862, pp. 107?192. Berlin-Heidelberg-New York: 1981
5. Progress in Math.;B. Moishezon,1983