@article{PismaZhETF.52.701,
    title = {$\pi$ phase in layered magnetic superconductors},
    author = {Andreev, A. V. and Buzdin, A. I. and Osgood, R. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {52},
    issue = {1},
    pages = {701},
    year = {1990},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17436.shtml},
}