@article{MZ_1987__196_173883,
     author = {Nolan R. Wallach},
     title = {A {Class} of {Non-Standard} {Modules} for {Affine} {Lie} {Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {303--314},
     publisher = {mathdoc},
     volume = {196},
     year = {1987},
     zbl = {0637.17011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__196_173883/}
}