University of St. Andrews (UK)
University of St. Andrews: Greek Number Systems
A comprehensive discussion of Greek number systems of the first millennium BC, including acrophonic and alphabetical. Includes examples demonstrating the lack of a truly unified system among the Greek islands.
Texas A&M University
Greek Numbers and Arithmetic
A brief description of the earliest Greek numberical notation, the Attic system, followed by a more detailed description of the alphabetical system that replaced it.