TODO supply a title

        @article{Siemens2005Connectivism,
          author  = {Siemens, George},
          title   = {Connectivism: A Learning Theory for the Digital Age},
          journal = {International Journal of Instructional Technology
                     and Distance Learning},
          volume  = {2},
          number  = {1},
          year    = {2005},
          url     = {http://www.itdl.org/Journal/Jan_05/article01.htm}
        }