@article{701724,
     title = {Sigma models in geometry},
     booktitle = {Proceedings of the 23rd Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2004},
     pages = {[79]-90},
     mrnumber = {MR2069396},
     zbl = {1051.53044},
     url = {http://dml.mathdoc.fr/item/701724}
}

Rocek, Martin. Sigma models in geometry, dans Proceedings of the 23rd Winter School "Geometry and Physics", GDML_Books,  (2004), pp. [79]-90. http://gdmltest.u-ga.fr/item/701724/