Osipowicz, G., and I. Sobkowiak-Tabaka. “New Evidences for Core Processing of Non-Flint, Lithic Materials in the Late Palaeolithic and Mesolithic of Poland”. Journal of Lithic Studies, Vol. 1, no. 1, Mar. 2014, pp. 213-26, doi:10.2218/jls.v1i1.774.