Application to Guide People with Visual Disability on Internal Buildings, Using Beacon Bluetooth Positioning Systems. - Patricio Lara-Alvarez; Janio Jadán-Guerrero; César Guevara-Maldonado; Sandra Sanchez-Gordon; Tania Calle-Jimenez; Luis Salvador-Ullauri; Patricia Acosta-Vargas; Wilmer Illescas Espinoza (AHFE (21), 2019)