@article{PismaZhETF.12.544,
    title = {Cooperative Tunnel Effect in Crystals},
    author = {Ionov, S. P. and Ionova, G. V. and Lyubimov, V. S. and Aleksandrov, A. Yu.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {12},
    issue = {12},
    pages = {544},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26383.shtml},
}