@article{JETPL.104.575, title = {}, author = {Luo, M. and Shen, Y. H. and , }, journal = {JETP Lett.}, volume = {104}, issue = {8}, pages = {557}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16200078}, note = {[Pisma v ZhETF 104, 575 (2016)]} }