@article{JETPL.108.88, title = {}, author = {Karashtin, E. A.}, journal = {JETP Lett.}, volume = {108}, issue = {2}, pages = {97}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18140035}, note = {[Pisma v ZhETF 108, 88 (2018)]} }