Anjani Achanta Mark McKenna Joseph Heyman Kevin Rudd Mark Hinders Peter J. Costianes Non-Linear Acoustic Concealed Weapons Detection. 21-27 2005 conf/aipr/2005 AIPR http://doi.ieeecomputersociety.org/10.1109/AIPR.2005.37 db/conf/aipr/aipr2005.html#AchantaMHRHC05