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@article{TUW-139729,
    author = {Weippl, Edgar and Tjoa, A Min},
    title = {Privacy in e-learning: Anonymity, pseudonyms and authenticated usage},
    journal = {Interactive Technology and Smart Education (ITSE)},
    year = {2005},
    volume = {2005},
    number = {2},
    pages = {247--256}
}