@article{JETPL.117.248,
    title = {},
    author = {Volovik, G. E.},
    journal = {JETP Lett.},
    volume = {117},
    issue = {3},
    pages = {240},
    year = {2023},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567823030114},
    note = {[Pisma v ZhETF 117, 248 (2023)]}
}