@article{JETPL.98.853, title = {}, author = {Sonin, E. B.}, journal = {JETP Lett.}, volume = {98}, issue = {11}, pages = {758}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13230215}, note = {[Pisma v ZhETF 98, 853 (2013)]} }