Key points are not available for this paper at this time.
Nicholas J. Conard, Marie Soressi, John E. Parkington, Sarah Wurz, Royden Yates, A Unified Lithic Taxonomy Based on Patterns of Core Reduction, The South African Archaeological Bulletin, Vol. 59, No. 179 (Jun., 2004), pp. 12-16
Conard et al. (2004) studied this question.