KIERNAN, K. Challenges for environmentally sustainable development of natural resources in the Nam Ou karst, northern Laos. Acta Carsologica, Ljubljana, Slovenija, v. 40, n. 2, 2011. DOI: 10.3986/ac.v40i2.18. Disponível em: https://ojs.zrc-sazu.si/carsologica/article/view/18. Acesso em: 4 may. 2024.