@article{PismaZhETF.82.358,
    title = {Vacuum energy:  quantum hydrodynamics vs quantum gravity},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {82},
    issue = {6},
    pages = {358},
    year = {2005},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_15956.shtml},
}