@article{JETPL.102.775, title = {}, author = {, and Magarill, L. I. and Chaplik, A. V.}, journal = {JETP Lett.}, volume = {102}, issue = {10}, pages = {683}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15220105}, note = {[Pisma v ZhETF 102, 775 (2015)]} }