Optimal test-point positions for calibrating an ultrasonic LPS system. - F. Daniel Ruiz; Jesús Ureña; Jose M. Villadangos; Isaac Gude; Juan Jesús García; Álvaro Hernández; Ana Jiménez (ETFA, 2008)

New Iterative Algorithm for Hyperbolic Positioning used in an Ultrasonic Local Positioning System. - F. Daniel Ruiz; Jesús Ureña; Isaac Gude; Jose M. Villadangos; Juan C. García 001; María del Carmen Pérez; Enrique García (ETFA, 2009)