@article{JETPL.100.79, title = {}, author = {Gus?kov, S. Yu.}, journal = {JETP Lett.}, volume = {100}, issue = {2}, pages = {71}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1414001X}, note = {[Pisma v ZhETF 100, 79 (2014)]} }