@article{grps2008-98,

   author = "Antonio Garrido, Eva Onaindia, Oscar Sapena",

   title = "Planning and Scheduling in an E-learning Environment. A Constraint-Programming-based approach",

   journal = "Engineering Applications of Artificial Intelligence",

   publisher = "Elsevier",

   volume = "21",

   number = "5",

   pages = "733-743",

   issn = "0952-1976",

   year = "2008"

}