Libera, J. and Mączyński, P. 2023. Contribution to the study of the chronology of bifacial flint axes based on finds from the Pieniany-Kolonia locality (Grzęda Sokalska). Archeologia Polski. 68, (Dec. 2023), 69–89. DOI:https://doi.org/10.23858/APol68.2023.003.