@article{PismaZhETF.44.157,
    title = {Vanishing of the vacuum energy for superstrings},
    author = {Morozov, A. Yu. and Perelomov, A. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {44},
    issue = {4},
    pages = {157},
    year = {1986},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20877.shtml},
}