@article{10_1090_S0894_0347_2014_00797_9,
     author = {Braverman, Alexander and Finkelberg, Michael},
     title = {Semi-infinite {Schubert} varieties and quantum {\ensuremath{\mathit{K}}-theory} of flag manifolds},
     journal = {Journal of the American Mathematical Society},
     pages = {1147--1168},
     year = {2014},
     volume = {27},
     number = {4},
     doi = {10.1090/S0894-0347-2014-00797-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2014-00797-9/}
}