TY - JOUR T1 - A review of techniques for ultrasonic indoor localization systems JF - The Journal of the Acoustical Society of America Y1 - 2019 A1 - J. Aparicio A1 - F. J. Álvarez A1 - Á. Hernández A1 - S. Holm PB - ASA CY - EEUU VL - 145 IS - 3 ER -