@article{SIGMA_2008_4_a69,
     author = {Evgeny Feigin},
     title = {The {PBW} {Filtration,} {Demazure} {Modules} and {Toroidal} {Current} {Algebras}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a69/}
}