%0 Journal Article %A Gaitsgory, Dennis %A Nadler, David %T Hecke operators on quasimaps into horospherical varieties %J Documenta mathematica %D 2009 %P 19-46 %V 14 %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2009__14__a26/ %G en %F DOCMA_2009__14__a26