@article{JETPL.110.534, title = {}, author = {, and Magarill, L. I. and Chaplik, A. V.}, journal = {JETP Lett.}, volume = {110}, issue = {8}, pages = {540}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19200049}, note = {[Pisma v ZhETF 110, 534 (2019)]} }