Beep: 3D indoor positioning using audible sound. - Atri Mandal; Cristina V. Lopes; Tony Givargis; Amir Haghighat; Raja Jurdak; Pierre Baldi (CCNC, 2005)

Localization of off-the-shelf mobile devices using audible sound: architectures, protocols and performance assessment. - Cristina Videira Lopes; Amir Haghighat; Atri Mandal; Tony Givargis; Pierre Baldi (ACM SIGMOBILE Mob. Comput. Commun. Rev., 2006)