@article{JETPL.100.843,
    title = {},
    author = {Volovik, G. E.},
    journal = {JETP Lett.},
    volume = {100},
    issue = {11},
    pages = {742},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14230118},
    note = {[Pisma v ZhETF 100, 843 (2014)]}
}