@article{JETPL.100.207, title = {}, author = {Kagan, M. Yu. and Kugel, K. I. and , and , }, journal = {JETP Lett.}, volume = {100}, issue = {3}, pages = {187}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14150090}, note = {[Pisma v ZhETF 100, 207 (2014)]} }