@article{JETPL.99.586, title = {}, author = {Sazonov, S. V. and Ustinov, N. V.}, journal = {JETP Lett.}, volume = {99}, issue = {9}, pages = {503}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14090021}, note = {[Pisma v ZhETF 99, 586 (2014)]} }