@article{JETPL.107.104, title = {}, author = {, and , and , and , and , and , and , }, journal = {JETP Lett.}, volume = {107}, issue = {2}, pages = {96}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18020054}, note = {[Pisma v ZhETF 107, 104 (2018)]} }