Mobile G-Portal supporting collaborative sharing and learning in geography fieldwork: an empirical study. - Yin Leng Theng; Kuah-Li Tan; Ee-Peng Lim; Jun Zhang 005; Dion Hoe-Lian Goh; Kalyani Chatterjea; Chew-Hung Chang; Aixin Sun; Han Yu 001; Nam Hai Dang; Yuanyuan Li 001; Minh Chanh Vo (JCDL, 2007)