1. Secure System For The Identification Of Persons Using Remote Searching Of Facial, Iris And Voice Biometric Templates, Sal Khan and Martin D. Levine, Patent No.US7225338, Issued May 29, 2007

2. Analog Feedback Rank Order Filter, Michael Blauer and Martin D. Levine. Patent No.5315171, Issued May 24, 1994 (U.S.); Patent No. Ca 2086172, Issued June 24, 1994. Canada.