@article{JETPL.100.64, title = {}, author = {Dolganov, P. V.}, journal = {JETP Lett.}, volume = {100}, issue = {1}, pages = {59}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14130116}, note = {[Pisma v ZhETF 100, 64 (2014)]} }