IMONIGIE, A. O.; AIGBODIOH, F.A.; OBOMEGHIE, M. A. Development of Automatic Sensor-Activated Umbrella System for Stationary out Door Application. Direct Research Journal of Engineering and Information Technology, [S. l.], v. 12, n. 2, p. 35–44, 2024. Disponível em: https://journals.directresearchpublisher.org/index.php/drjeit/article/view/319. Acesso em: 13 jun. 2026.