@article{PismaZhETF.113.624,
    title = {Negative temperature: further extensions},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {113},
    issue = {9},
    pages = {624},
    year = {2021},
    doi = {10.31857/S123456782109010X},
    url = {http://jetpletters.ru/ps/dx/10.31857/S123456782109010X},
}