@article{10_4007_annals_2004_160_1057,
     author = {Hiraku Nakajima},
     title = {Quiver varieties and $t$-analogs of $q$-characters of quantum affine algebras},
     journal = {Annals of mathematics},
     pages = {1057--1097},
     publisher = {mathdoc},
     volume = {160},
     number = {3},
     year = {2004},
     doi = {10.4007/annals.2004.160.1057},
     mrnumber = {2144973},
     zbl = {1140.17015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2004.160.1057/}
}