Software for data interoperability between multivendor PDI in videoconferencing in the UNED - Rodrigo, Covadonga; Vazquez, Noe; Alonso, Vanesa; Santos, Martin; Gago, David; Vazquez, Marta; Carnicero, Fernando; Sernandez, Antonio; Novo, Maria; Martinez, Dario (SISTEMAS E TECNOLOGIAS DE INFORMACAO, VOL I, 2011)