BILLINGHURST, Mark N.; HENRYSSON, Anders. Research Directions in Handheld AR. International Journal of Virtual Reality, [S. l.], v. 5, n. 2, p. 51–58, 2006. DOI: 10.20870/IJVR.2006.5.2.2690. Disponível em: https://ijvr.eu/article/view/2690. Acesso em: 7 dec. 2025.