@article{PismaZhETF.78.1271,
    title = {Universal temperature corrections to the free energy for the gravitational field},
    author = {Volovik, G. E. and Zelnikov, A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {78},
    issue = {12},
    pages = {1271},
    year = {2003},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_1940.shtml},
}