@article{JETPL.102.830, title = {}, author = {Khanin, Yu. N. and Vdovin, E. E. and , and , }, journal = {JETP Lett.}, volume = {102}, issue = {11}, pages = {720}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15230058}, note = {[Pisma v ZhETF 102, 830 (2015)]} }