Reference:

Kai Puolamäki and Samuel Kaski, editors. Proceedings of the NIPS 2005 Workshop on Machine Learning for Implicit Feedback and User Modeling, 2006.

Suggested BibTeX entry:

@proceedings{Puolamaki06inips,
    editor = {Kai Puolam\"aki and Samuel Kaski},
    title = {Proceedings of the {NIPS} 2005 Workshop on Machine Learning for Implicit Feedback and User Modeling},
    year = {2006},
}