Bahn, S., Rhiu, I., Kim, W., Lee, J., & Yun, M. H. (2011). Usability of Ubiquitous Services: A Critical Review of Literature from evaluation of ubiquitous service. 대한인간공학회 학술대회논문집, 72-77.

http://www.dbpia.co.kr/Journal/articleDetail?nodeId=NODE01815747