@article{PismaZhETF.11.68,
    title = {Second Order Phase Transitions Close in Temperature},
    author = {Levanyuk, A. P. and Sannikov, D. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {11},
    issue = {1},
    pages = {68},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26059.shtml},
}