@article{JETPL.99.195, title = {}, author = {, and , }, journal = {JETP Lett.}, volume = {99}, issue = {3}, pages = {174}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14030138}, note = {[Pisma v ZhETF 99, 195 (2014)]} }