@article{JETPL.97.592, title = {}, author = {Yasnikov, I. S.}, journal = {JETP Lett.}, volume = {97}, issue = {9}, pages = {513}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13090026}, note = {[Pisma v ZhETF 97, 592 (2013)]} }