@article{JETPL.99.837,
    title = {},
    author = {Kulik, S. P. and Molotkov, S. N.},
    journal = {JETP Lett.},
    volume = {99},
    issue = {12},
    pages = {725},
    year = {2014},
    doi = {},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1412011X},
    note = {[Pisma v ZhETF 99, 837 (2014)]}
}