@article{JETPL.102.111, title = {}, author = {Martynov, S. N.}, journal = {JETP Lett.}, volume = {102}, issue = {2}, pages = {100}, year = {2015}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15140076}, note = {[Pisma v ZhETF 102, 111 (2015)]} }