@article{articleb743040b,
title   = {Synthesis of facial expressions in photographs: characteristics, approaches, and challenges},
author = {Testa, Rafael Luiz and Corrêa, Cleber Gimenez and Lima, Ariane Machado and Marques, Fátima de Lourdes dos Santos Nunes},
year = {2019},
doi = {10.1145/3292652},
journal   = {ACM Computing Surveys}
}