@misc {IOPORT.70030588,
    author       = {Zambarbieri, Daniela and Robino, Carlo and Crespi, Sofia and Calvi, Licia and Luccini, A. Marco},
    title        = {Design guidelines for E-learning systems},
    howpublished = {WEBIST (2), 392-397 (2006).},
    year         = {2006},
    identifier   = {70030588},
}