@article{SIGMA_2012_8_a39,
     author = {Dra\v{z}en Adamovi\'c and Ozren Per\v{s}e},
     title = {The vertex algebra $m(1)^+$ and certain affine vertex algebras of level $-1$},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a39/}
}