Stephen J. H. Yang Jia Zhang 0001 Addison Y. S. Su Jeffrey J. P. Tsai A collaborative multimedia annotation tool for enhancing knowledge sharing in CSCL. 45-62 2011 19 Interact. Learn. Environ. 1 https://doi.org/10.1080/10494820.2011.528881 db/journals/ile/ile19.html#YangZST11