Ferk, M., M. Lipar, A. Šmuc, R. N. Drysdale, and J. Zhao. “Chronology of Heterogeneous Deposits in the Side Entrance of Postojna Cave, Slovenia”. Acta Geographica Slovenica, vol. 59, no. 1, Jan. 2019, pp. 103–116, doi:10.3986/AGS.7059.