1. Introduction to Compact Transformation Groups;Bredon,1972
2. Complexes of trees and nested set complexes;Feichtner;Pacific J. Math.,2006
3. Morse theory for cell complexes;Forman;Adv. Math.,1998
4. Stratified Morse Theory;Goresky,1988
5. Closure maps on regular trisps;Kozlov;Topology Appl.,2009