@article{JETPL.109.118, title = {}, author = {Petrov, E. K. and Silkin, I. V. and Menshchikova, T. V. and Chulkov, E. V.}, journal = {JETP Lett.}, volume = {109}, issue = {2}, pages = {121}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19020103}, note = {[Pisma v ZhETF 109, 118 (2019)]} }