@article{PismaZhETF.32.673,
    title = {Production of massless particles by a conformally flat, gravitational field},
    author = {Dolgov, A. D.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {32},
    issue = {11},
    pages = {673},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22000.shtml},
}