@article{JETPL.102.899, title = {}, author = {Troitsky, S. V.}, journal = {JETP Lett.}, volume = {102}, issue = {12}, pages = {785}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15240017}, note = {[Pisma v ZhETF 102, 899 (2015)]} }