@article{JETPL.107.260, title = {}, author = {Alisultanov, Z. Z.}, journal = {JETP Lett.}, volume = {107}, issue = {4}, pages = {254}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18040100}, note = {[Pisma v ZhETF 107, 260 (2018)]} }