@article{JETPL.102.265, title = {}, author = {, and , and Chekalin, S. V. and , }, journal = {JETP Lett.}, volume = {102}, issue = {4}, pages = {235}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15160092}, note = {[Pisma v ZhETF 102, 265 (2015)]} }