@article{JETPL.101.315, title = {}, author = {, and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , and , }, journal = {JETP Lett.}, volume = {101}, issue = {5}, pages = {289}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1505001X}, note = {[Pisma v ZhETF 101, 315 (2015)]} }