@article{JETPL.108.388, title = {}, author = {, and Shashkov, E. V. and Vorob?ev, N. S. and , }, journal = {JETP Lett.}, volume = {108}, issue = {6}, pages = {364}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18180042}, note = {[Pisma v ZhETF 108, 388 (2018)]} }