@article{PismaZhETF.53.273,
    title = {A linear extension of the Virasoro algebra},
    author = {Arakelyan, T. A. and Savvidi, G. K.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {53},
    issue = {6},
    pages = {273},
    year = {1991},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17405.shtml},
}