@article{JETPL.103.452, title = {}, author = {, and , and , and Chapovsky, P. L.}, journal = {JETP Lett.}, volume = {103}, issue = {6}, pages = {403}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16060084}, note = {[Pisma v ZhETF 103, 452 (2016)]} }