From Wikipedia: Leon Chua, who is considered to be the father of non-linear circuit theory, has argued that all 2-terminal non-volatile memory devices includin

From Wikipedia: Leon Chua, who is considered to be the father of non-linear circuit theory, has argued that all 2-terminal non-volatile memory devices including phase change memory should be considered memristors. Stan Williams of HP Labs has also argued that phase change memory should be considered to be a memristor. https://en.wikipedia.org/wiki/Phase-change_memory https://en.wikipedia.org/wiki/Phase-change_memory