@article{JETPL.104.32, title = {}, author = {Kukushkin, V. I. and Kirpichev, V. E. and Kukushkin, I. V.}, journal = {JETP Lett.}, volume = {104}, issue = {1}, pages = {37}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16130087}, note = {[Pisma v ZhETF 104, 32 (2016)]} }