Τσουκαλάς Ν. and Παπαδοπούλου - Βρυνιώτη Κ., “THE KARST IN ANO VLASSIA ACHAIA (GREECE) AND THE CONTRIBUTION OF OLONOS -PINDOS GEOTECTONIC UNIT ON ITS FORMATION”, geosociety, vol. 36, no. 2, pp. 1068–1076, Jul. 2018.