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- 2000
-
Mark
Tourism – sustainable development option?
(
- Contribution to journal › Article
- 1999
-
Mark
Ecotourism - a means to safeguard biodiversity and ecosystem functions?
(
- Contribution to journal › Article
- 1996
-
Mark
Klimaökologische Auswirkungen des Flugverkehrs
(
- Contribution to journal › Article