@article{PismaZhETF.29.540,
    title = {New type of magnetic phase transitions of the first kind},
    author = {Nagaev, E. L. and Kovalenko, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {29},
    issue = {9},
    pages = {540},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22142.shtml},
}