A. I. Alrabady, “Security of Passive Access Vehicle,” Submitted to the Graduate School of Wayne State University, Detroit, Michan.
 A. I. Alrabady and S. M. Mahmud, “Some Attacks against Vehicle’s Passive Entry Security Systems and Their Solutions,” IEEE Transactions on Vehicular Technology, Vol. 52, No. 2, March 2003.
 A. I. Alrabady and S. M. Mahmud, “Analysis of Attacks against the Security of Keyless-Entry Systems for Vehicles and Suggestions for Improved Designs,” IEEE Transactions on Vehicular Technology, Vol. 54, No. 1, January 2005.
 A. Francillon, B. Danev, S. Capkun, “Relay Attacks on Passive Keyless Entry and Start Systems in Modern Cars,” Department of Computer Science ETH Zurich 8092 Zurich, Switzerland.
 F. Stajano, F.-L. Wong and B. Christianson, “Multichannel Protocols to Prevent Relay Attack,” University of Cambridge Computer Laboratory, Cambridge, United Kingdom, DSO National Laboratories, Singapore, University of Hertfordshire, School of Computer Science, Hatfield, United Kingdom.
 A. Leitch, “Electronic Communication System, in Particular Access Control System for Passive Keyless Entry, as well as Method for Detecting a Relay Attack Thereon,” US Patent No. 0206989A1, 2009
 R. Ghabra, Y. Luo, J. Nantz and R. O. King, “Method for Apparatus for an Anti-theft System against Radio Relay Attack in Passive Keyless Entry/Start Systems,” US Patent No. 0143500A1, 2008
 R. Ghabra, N. Yakovenko and H. W. Girard, “Method and System of determining and Preventing Relay Attack for Passive Entry/Start System,” US Patent No. 0321154 A1, 2008
 H. Masudaya, “Passive Entry with Anti-theft Function,” US Patent No. 0168997A1, 2005
 E. Perraud and M. Burri, “Passive Response Communication System,” US Patent No. 6992568B2, 2006
 C. Tieman, J. Coudre and T. P. Oman “Vehicle Security System and Method of Operation Based on a Nomadic device Location,” US Patent No. 201202.