Cristina Videira Lopes Amir Haghighat Atri Mandal Tony Givargis Pierre Baldi Localization of off-the-shelf mobile devices using audible sound: architectures, protocols and performance assessment. 38-50 2006 10 Mobile Computing and Communications Review 2 http://doi.acm.org/10.1145/1137975.1137980 db/journals/sigmobile/sigmobile10.html#LopesHMGB06