@article{JETPL.106.288, title = {}, author = {Stepina, N. P. and Nenashev, A. V. and Dvurechenskii, A. V.}, journal = {JETP Lett.}, volume = {106}, issue = {5}, pages = {308}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17170052}, note = {[Pisma v ZhETF 106, 288 (2017)]} }