@article{JETPL.107.342, title = {}, author = {, and Rosanov, N. N. and , }, journal = {JETP Lett.}, volume = {107}, issue = {5}, pages = {327}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18050132}, note = {[Pisma v ZhETF 107, 342 (2018)]} }