Revealing the nature of contemporary tourism research: extracting common subject areas through bibliographic coupling / Yulan Yuan, Ulrike Gretzel, Yuen-Hsien Tseng
Intelligent systems in tourism: a social science perspective / Ulrike Gretzel
Semantic representation of tourism on the internet / Zheng Xiang, Ulrike Gretzel, Daniel R. Fesenmaier
Tourism managers' adoption of marketing decision support systems / Karl Wöber W., Ulrike Gretzel