@article{PismaZhETF.53.150,
    title = {Closed Abrikosov vortices in type-II superconductors},
    author = {Kozlov, V. A. and Samokhvalov, A. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {53},
    issue = {3},
    pages = {150},
    year = {1991},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17378.shtml},
}