Willson Lin Peggy Li Tak-Wai Chan Oskar Y. M. Ku Hercy N. H. Cheng Enhancing Feedbacks on Learning Word Problems with a Small Game. 237-239 2010 DIGITEL https://doi.org/10.1109/DIGITEL.2010.10 https://doi.ieeecomputersociety.org/10.1109/DIGITEL.2010.10 conf/digitel/2010 db/conf/digitel/digitel2010.html#LinLCKC10