@article{JETPL.109.610, title = {}, author = {Ramazanov, M. K. and Murtazaev, A. K.}, journal = {JETP Lett.}, volume = {109}, issue = {9}, pages = {589}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X1909008X}, note = {[Pisma v ZhETF 109, 610 (2019)]} }