@article{grps2011-152,

   author = "Antonio Garrido, Lluvia Morales, Ivan Serina",

   title = "On the Necessity of Time and Resource Issues to Support Collaboration in E-learning Standards",

   journal = "IEEE Learning Technology Newsletter ",

   publisher = "IEEE, Technical Committee on Learning Technology",

   issn = "1438-0625",

   year = "2011"

}