@article{JETPL.110.197, title = {}, author = {Petrov, A. V. and Yusupov, R. V. and Nikitin, S. I. and , and , and Kiiamov, A. G. and Tagirov, L. R.}, journal = {JETP Lett.}, volume = {110}, issue = {3}, pages = {217}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19150116}, note = {[Pisma v ZhETF 110, 197 (2019)]} }