@article{01985398, title = {Generalized orbifold Euler characteristics of symmetric orbifolds and covering spaces.}, journal = {Geometry \& Topology}, volume = {7}, year = {2003}, pages = {791-856}, doi = {10.2140/agt.2003.3.791}, zbl = {1037.57022}, language = {en}, url = {http://dml.mathdoc.fr/item/01985398} }
Tamanoi, Hirotaka. Generalized orbifold Euler characteristics of symmetric orbifolds and covering spaces.. Geometry & Topology, Tome 7 (2003) pp. 791-856. doi : 10.2140/agt.2003.3.791. http://gdmltest.u-ga.fr/item/01985398/