@ARTICLE {29902, author={A. Moghaddam and F. Pereira and P.L. Correia}, doi={10.1049/iet-bmt.2019.0001}, journal={IET Biometrics}, title={Face recognition: a novel multi-level taxonomy based survey}, year={2020}, month={March}, volume={9}, number={2}, pages={58-67}, ISSN={2047-4938} }