@article{PismaZhETF.55.153,
    title = {Nonperturbative boson string and $Diffs^1/Sl(2,R)$},
    author = {Merkulov, S. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {55},
    issue = {3},
    pages = {153},
    year = {1992},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_19209.shtml},
}