@article{JETPL.110.314, title = {}, author = {, and Petrosyan, A. S.}, journal = {JETP Lett.}, volume = {110}, issue = {5}, pages = {329}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19170053}, note = {[Pisma v ZhETF 110, 314 (2019)]} }