@article{JETPL.106.3, title = {}, author = {AlFiky, M. T. and Hamed, A. M.}, journal = {JETP Lett.}, volume = {106}, issue = {1}, pages = {1}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1713001X}, note = {[Pisma v ZhETF 106, 3 (2017)]} }