@article{JETPL.102.211, title = {}, author = {, and Kuznetsov, A. S.}, journal = {JETP Lett.}, volume = {102}, issue = {3}, pages = {184}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15150096}, note = {[Pisma v ZhETF 102, 211 (2015)]} }