@article{JETPL.110.81, title = {}, author = {, and Pantuev, V. S.}, journal = {JETP Lett.}, volume = {110}, issue = {2}, pages = {91}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/0/article_33540.shtml}, note = {[Pisma v ZhETF 110, 81 (2019)]} }