@article{PismaZhETF.18.435,
    title = {Resonant pair production in a strong electric field},
    author = {Popov, V. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {18},
    issue = {7},
    pages = {435},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24013.shtml},
}