Roberto Calvo-Palomino, Pedro de las Heras Quirós, José Antonio Santos-Cadenas, Raúl Román-López, Daniel Izquierdo-Cortazar. Outdoors Monitoring of Elderly People Assisted by Compass, GPS and Mobile Social Network. In Sigeru Omatu, Miguel Rocha, José Bravo, Florentino Fernández Riverola, Emilio Corchado, Andrés Bustillo, Juan M. Corchado, editors, Distributed Computing, Artificial Intelligence, Bioinformatics, Soft Computing, and Ambient Assisted Living, 10th International Work-Conference on Artificial Neural Networks, IWANN 2009 Workshops, Salamanca, Spain, June 10-12, 2009. Proceedings, Part II. Volume 5518 of Lecture Notes in Computer Science, pages 808-811, Springer, 2009. [doi]