@article{JETPL.109.564, title = {}, author = {, and Turlapov, A. V.}, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {552}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19080137}, note = {[Pisma v ZhETF 109, 564 (2019)]} }