@article{JETPL.108.299, title = {}, author = {Davidovich, M. V.}, journal = {JETP Lett.}, volume = {108}, issue = {5}, pages = {279}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18170010}, note = {[Pisma v ZhETF 108, 299 (2018)]} }