Osipowicz, Grzegorz, and Iwona Sobkowiak-Tabaka. 2014. “New Evidences for Core Processing of Non-Flint, Lithic Materials in the Late Palaeolithic and Mesolithic of Poland”. Journal of Lithic Studies 1 (1), 213-26. https://doi.org/10.2218/jls.v1i1.774.