@article{JETPL.103.411, title = {}, author = {Zakharov, B. G.}, journal = {JETP Lett.}, volume = {103}, issue = {6}, pages = {363}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16060011}, note = {[Pisma v ZhETF 103, 411 (2016)]} }