@article{JETPL.113.624,
    title = {Negative Temperature: Further Extensions},
    author = {Volovik, G. E.},
    journal = {JETP Lett.},
    volume = {113},
    issue = {9},
    pages = {602},
    year = {2021},
    doi = {10.1134/S0021364021090058},
    url = {http://jetpletters.ru/ps/dx/10.31857/S123456782109010X},
    note = {[Pisma v ZhETF 113, 624 (2021)]}
}