@article{JETPL.105.725, title = {}, author = {Zakharov, B. G.}, journal = {JETP Lett.}, volume = {105}, issue = {12}, pages = {758}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17120025}, note = {[Pisma v ZhETF 105, 725 (2017)]} }