@article{JETPL.102.903, title = {}, author = {, and , and , and , and , }, journal = {JETP Lett.}, volume = {102}, issue = {12}, pages = {789}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15240029}, note = {[Pisma v ZhETF 102, 903 (2015)]} }