@article{10_4171_dm_264,
     author = {Dennis Gaitsgory and David Nadler},
     title = {Hecke operators on quasimaps into horospherical varieties},
     journal = {Documenta mathematica},
     pages = {19--46},
     year = {2009},
     volume = {14},
     doi = {10.4171/dm/264},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/264/}
}