@article{JETPL.100.644, title = {}, author = {, and Magarill, L. I.}, journal = {JETP Lett.}, volume = {100}, issue = {9}, pages = {566}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14210061}, note = {[Pisma v ZhETF 100, 644 (2014)]} }