1. [1] Beilinson, Alexander A. How to glue perverse sheaves, Lecture Notes in Mathematics, 1289 (1987), pp. 42-51
2. [2] Beilinson, Alexander A.; Bernstein, Joseph; Deligne, Pierre Faisceaux pervers, Astérisque, 100, Société Mathématique de France, 1982
3. On the Reducibility of Characteristic Varieties;Braden, Tom;Proc. Am. Math. Soc.,2002
4. [4] Dimca, Alexandru Sheaves in Topology, Universitext, Springer, 2004
5. Intersection homology theory;Goresky, Mark;Topology,1980