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Mark L. Lawall, Graffiti, Wine Selling, and the Reuse of Amphoras in the Athenian Agora, CA. 430 to 400 B.C., Hesperia: The Journal of the American School of Classical Studies at Athens, Vol. 69, No. 1 (Jan. - Mar., 2000), pp. 3-90
Mark L. Lawall (Sat,) studied this question.