HAÜSELMANN, P.; TOGNINI, P. Kaltbach Cave (Siebenhengste, Switzerland): Phantom of the Sandstone?. Acta Carsologica, Ljubljana, Slovenija, v. 34, n. 2, 2016. DOI: 10.3986/ac.v34i2.265. Disponível em: https://ojs.zrc-sazu.si/carsologica/article/view/265. Acesso em: 5 may. 2024.