@article{JETPL.104.862, title = {}, author = {Golubov, A. A. and Kupriyanov, M. Yu. and Khapaev, M. M.}, journal = {JETP Lett.}, volume = {104}, issue = {12}, pages = {847}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16240061}, note = {[Pisma v ZhETF 104, 862 (2016)]} }