@article{1104162092, author = {Witten, Edward}, title = {Topological sigma models}, journal = {Comm. Math. Phys.}, volume = {113}, number = {4}, year = {1988}, pages = { 411-449}, language = {en}, url = {http://dml.mathdoc.fr/item/1104162092} }
Witten, Edward. Topological sigma models. Comm. Math. Phys., Tome 113 (1988) no. 4, pp. 411-449. http://gdmltest.u-ga.fr/item/1104162092/