Implementation of a Smart System Digital Image Processing of Stair Detection for Covid-19 Robot with Haar-Like Feature Method. Internetworking Indonesia Journal, [S. l.], v. 13, n. 2, p. 3–9, 2021. Disponível em: https://www.internetworkingindonesia.org/index.php/iij/article/view/55.. Acesso em: 21 oct. 2025.