Carlos Alario-Hoyos, Miguel L. Bote-Lorenzo, Eduardo Gómez-Sánchez, Juan I. Asensio-Pérez, Guillermo Vega-Gorgojo, Adolfo Ruiz-Calleja. GLUE!: An architecture for the integration of external tools in Virtual Learning Environments. Computers & Education, 60(1):122-137, 2013. [doi]
Abstract is missing.