@article{JETPL.94.678, title = {}, author = {Grigoriev, S. V. and , and Napolskii, K. S. and , and , and , and , and , }, journal = {JETP Lett.}, volume = {94}, issue = {8}, pages = {635}, year = {2011}, doi = {}, url = {http://jetpletters.ru/ps/0/article_29562.shtml}, note = {[Pisma v ZhETF 94, 678 (2011)]} }