Angelova, Dora, M’hamed Alaeddin Belfoul, Sophia Bouzid, Mustapha Filahi, in Farid Faik. „Paleoseismic Phenomena in Karst Terrains in Bulgaria and Morocco“. Acta Carsologica 32, no. 1 (maj 23, 2016). Pridobljeno april 8, 2025. https://ojs.zrc-sazu.si/carsologica/article/view/367.