@article{PismaZhETF.70.705,
    title = {Vierbein walls in condensed matter},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {70},
    issue = {11},
    pages = {705},
    year = {1999},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_14081.shtml},
}