ĆALIĆ-LJUBOJEVIĆ, J. Natural Bridges on the Vratna River (Eastern Serbia) as the Last Remnants of a Former Cave. Acta Carsologica, Ljubljana, Slovenija, v. 29, n. 2, 2016. DOI: 10.3986/ac.v29i2.463. Disponível em: https://ojs.zrc-sazu.si/carsologica/article/view/463. Acesso em: 20 apr. 2024.