@article{JETPL.106.485, title = {}, author = {Klokov, A. Yu. and Krivobok, V. S. and , and , and , }, journal = {JETP Lett.}, volume = {106}, issue = {8}, pages = {503}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17200048}, note = {[Pisma v ZhETF 106, 485 (2017)]} }