@ARTICLE {34064,
author={M.  Sajjad and F.  Ullah and M.  Ullah and G.  Christodoulou and F.  Cheikh and M.  Hijji and K.  Muhammad and J. R. Rodrigues},
doi={10.1016/j.aej.2023.01.017},
journal={AEJ - Alexandria Engineering Journal},
title={A comprehensive survey on deep facial expression recognition: challenges, applications, and future guidelines},
year={2023},
month={April},
volume={68},
number={1},
pages={817-840},
ISSN={1110-0168}
}