@article{JETPL.99.329, title = {}, author = {Kolesnikov, S. V.}, journal = {JETP Lett.}, volume = {99}, issue = {5}, pages = {286}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14050105}, note = {[Pisma v ZhETF 99, 329 (2014)]} }