https://vocabularyserver.com/ttla/en/https://vocabularyserver.com/ttla/en/xml.php?skosTema=940Stress https://vocabularyserver.com/ttla/en/xml.php?skosTema=940 Indicators of sustainibility in tourism BT https://vocabularyserver.com/ttla/en/xml.php?skosTema=940 Tourist concentrations RT https://vocabularyserver.com/ttla/en/xml.php?skosTema=940 Harmful effects of tourism RT