@article{JETPL.98.296, title = {}, author = {Klumov, B. A.}, journal = {JETP Lett.}, volume = {98}, issue = {5}, pages = {259}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13170049}, note = {[Pisma v ZhETF 98, 296 (2013)]} }