@article{JETPL.100.561, title = {}, author = {, and , and , and Vukolov, A. V.}, journal = {JETP Lett.}, volume = {100}, issue = {8}, pages = {503}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14200053}, note = {[Pisma v ZhETF 100, 561 (2014)]} }