@article{JETPL.105.209, title = {}, author = {Zakharov, B. G.}, journal = {JETP Lett.}, volume = {105}, issue = {4}, pages = {219}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17040026}, note = {[Pisma v ZhETF 105, 209 (2017)]} }