@article{PismaZhETF.109.10,
    title = {Negative temperature for negative lapse function},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {109},
    issue = {1},
    pages = {10},
    year = {2019},
    doi = {10.1134/S0370274X19010028},
    url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19010028},
}