@article{JETPL.104.587, title = {}, author = {, and Kudryashov, S. I.}, journal = {JETP Lett.}, volume = {104}, issue = {8}, pages = {573}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16200108}, note = {[Pisma v ZhETF 104, 587 (2016)]} }