Ferrara, F., I. Torre, L. Sarti, C. Tasso, A. Dattolo, S. Bocconi, and J. Earp. “Resources and Users in the Tagging Process: Approaches and Case Studies”. Journal of E-Learning and Knowledge Society, Vol. 6, no. 2, May 2010, doi:10.20368/1971-8829/411.