Difficulty Analysis for Learners in Problem Solving Process Based on the Knowledge Map. - Rita Kuo; Wei-Peng Lien; Maiga Chang; Jia-Sheng Heh (ICALT, 2003)

Analyzing Problem's Difficulty based on Neural Networks and Knowledge Map. - Rita Kuo; Wei-Peng Lien; Maiga Chang; Jia-Sheng Heh (J. Educ. Technol. Soc., 2004)