@article{RM_2017_72_4_a3,
     author = {B. L. Feigin},
     title = {Extensions of vertex algebras. {Constructions} and applications},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {707--763},
     publisher = {mathdoc},
     volume = {72},
     number = {4},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2017_72_4_a3/}
}