Visitor steering concept for the Kalkalpen National Park PART 1

Creation of a concept about recreational facilities in the Kalkalpen National Park and their influence on visitor flows and ecosystems, i.a. of the Kalkalpen National Park, February 19911991年2月完成的针对卡尔卡彭国家公园（Kalkalpen National Park）内休闲设施及其对游客流量与生态系统影响的相关概念构建工作，其中涵盖卡尔卡彭国家公园相关研究内容。