DERVINIS, D. Head Orientation Estimation using Characteristic Points of Face. Elektronika ir Elektrotechnika, [S. l.], v. 72, n. 8, p. 61-64, 2006. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/10790. Acesso em: 5 oct. 2022.