Martin Memmel Rafael Schirru Martin Wolpers Eleftheria Tomadaki Towards the Combined Use of Metadata to Improve the Learning Experience. 930-932 2008 ICALT https://doi.org/10.1109/ICALT.2008.131 https://doi.ieeecomputersociety.org/10.1109/ICALT.2008.131 conf/icalt/2008 db/conf/icalt/icalt2008.html#MemmelSWT08