James C. Wright, John F. Cherry, Jack L. Davis, Eleni Mantzourani, Susan B. Sutton, Robert F. Sutton Jr., The Nemea Valley Archaeological Project a Preliminary Report, Hesperia: The Journal of the American School of Classical Studies at Athens, Vol. 59, No. 4 (Oct. - Dec., 1990), pp. 579-659
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Wright et al. (1990) studied this question.