@article{PismaZhETF.105.691,
    title = {Fermi points and the Nambu sum rule in the polar phase of $^{\bf3}$He$^{1)}$ },
    author = {Zubkov, M. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {105},
    issue = {11},
    pages = {691},
    year = {2017},
    doi = {10.7868/S0370274X17110078},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17110078},
}