@article{PismaZhETF.45.357,
    title = {Violation of the Migdal theorem for a strongly coupled electron-phonon system},
    author = {Aleksandrov, A. S. and Grebenev, V. N. and Mazur, E. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {45},
    issue = {7},
    pages = {357},
    year = {1987},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18777.shtml},
}