@article{JETPL.103.572, title = {}, author = {Kukushkin, V. I. and , and Egorov, S. V. and Solov?ev, V. V. and Kukushkin, I. V.}, journal = {JETP Lett.}, volume = {103}, issue = {8}, pages = {508}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16080038}, note = {[Pisma v ZhETF 103, 572 (2016)]} }