Erik Brunvand, Alan Davis, and Ian Robinson, "Memory Apparatus and
Method for Retrieving Sequences of Symbols Including Variable
Elements," U.S. Patent No. 4,748,439, issued May 31, 1988.
Erik Brunvand and Alan Davis, "Circulating Context Addressable
Memory," U.S. Patent No. 4,924,435, issued May 8 1990.
Last modified Oct. 21 1996