@article{CM_1988__67_3_315_0,
     author = {Chari, Vyjayanthi and Pressley, Andrew},
     title = {Unitary representations of the {Virasoro} algebra and a conjecture of {Kac}},
     journal = {Compositio Mathematica},
     pages = {315--342},
     publisher = {Kluwer Academic Publishers},
     volume = {67},
     number = {3},
     year = {1988},
     mrnumber = {959215},
     zbl = {0661.17022},
     language = {en},
     url = {http://www.numdam.org/item/CM_1988__67_3_315_0/}
}