@article{PismaZhETF.117.556,
    title = {Acoustic metric and Planck constants},
    author = {Volovik, G. E},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {117},
    issue = {7},
    pages = {556},
    year = {2023},
    doi = {10.31857/S1234567823070121},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567823070121},
}