@article{JETPL.105.437, title = {}, author = {Alisultanov, Z. Z.}, journal = {JETP Lett.}, volume = {105}, issue = {7}, pages = {442}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17070050}, note = {[Pisma v ZhETF 105, 437 (2017)]} }