@article{SIGMA_2008_4_a58,
     author = {Dmitry Fuchs and Constance Wilmarth},
     title = {Projections of {Singular} {Vectors} of {Verma} {Modules} over {Rank~2} {Kac{\textendash}Moody} {Lie} {Algebras}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a58/}
}