@article{JETPL.97.409, title = {}, author = {, and Tikhonova, O. V.}, journal = {JETP Lett.}, volume = {97}, issue = {6}, pages = {362}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13060143}, note = {[Pisma v ZhETF 97, 409 (2013)]} }