@article{JETPL.110.361, title = {}, author = {Zakharov, B. G.}, journal = {JETP Lett.}, volume = {110}, issue = {6}, pages = {375}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19180012}, note = {[Pisma v ZhETF 110, 361 (2019)]} }