@article{JETPL.94.697, title = {}, author = {Khodel, V. A.}, journal = {JETP Lett.}, volume = {94}, issue = {8}, pages = {653}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29565.shtml}, note = {[Pisma v ZhETF 94, 697 (2011)]} }