1.		Tourism subfield identification via journal clustering / Yulan Y. Yuan, Yuen-Hsien, Chun-Yen Chang Autor: Yulan, Y. Yuan Coautor: ; Yuen-Hsien, Tseng Chun-Yen, Chang COTA(S): RE-1253
2.		Revealing the nature of contemporary tourism research: extracting common subject areas through bibliographic coupling / Yulan Yuan, Ulrike Gretzel, Yuen-Hsien Tseng Autor: Yulan, Y. Yuan Coautor: ; Gretzel, Ulrike Yuen-Hsien, Tseng COTA(S): RE-1610