HÄUSELMANN, P. UIS Cave Symbols: The definitive List. Acta Carsologica, Ljubljana, Slovenija, v. 31, n. 3, 2016. DOI: 10.3986/ac.v31i3.386. Disponível em: https://ojs.zrc-sazu.si/carsologica/article/view/386. Acesso em: 25 apr. 2024.