@article{JETPL.100.397, title = {}, author = {Rubtsov, G. I. and Troitsky, S. V.}, journal = {JETP Lett.}, volume = {100}, issue = {6}, pages = {355}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/0/article_30915.shtml}, note = {[Pisma v ZhETF 100, 397 (2014)]} }