@article{JETPL.99.382, title = {}, author = {Bobkov, A. M. and Bobkova, I. V.}, journal = {JETP Lett.}, volume = {99}, issue = {6}, pages = {333}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1406006X}, note = {[Pisma v ZhETF 99, 382 (2014)]} }