Rafael Duque Crescencio Bravo Manuel Ortega A Conceptual Model for Analysing Collaborative Work and Products in Groupware Systems. 125-132 2009 CDVE http://dx.doi.org/10.1007/978-3-642-04265-2_17 conf/cdve/2009 db/conf/cdve/cdve2009.html#DuqueBO09