@article{JETPL.109.516, title = {}, author = {AlFiky, M. T. and Elsherif, O.}, journal = {JETP Lett.}, volume = {109}, issue = {8}, pages = {507}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19080046}, note = {[Pisma v ZhETF 109, 516 (2019)]} }