@article{JETPL.98.613, title = {}, author = {, and Presnyakov, I. A. and , and , and , and , }, journal = {JETP Lett.}, volume = {98}, issue = {9}, pages = {544}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13210066}, note = {[Pisma v ZhETF 98, 613 (2013)]} }