@article{JETPL.98.33, title = {}, author = {Alshits, V. I. and , and Petrzhik, E. A. and , and , and , and , }, journal = {JETP Lett.}, volume = {98}, issue = {1}, pages = {28}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13130079}, note = {[Pisma v ZhETF 98, 33 (2013)]} }