@article{PismaZhETF.33.549,
    title = {Quantum fluctuations and a nonsingular universe},
    author = {Mukhanov, V. F. and Chibisov, G. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {33},
    issue = {10},
    pages = {549},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23079.shtml},
}