Reference:

M. Nickles, T. Froehner, and G. Weiß. Social annotation of semantically heterogeneous knowledge. In Proceedings of the 4th International Workshop on Knowledge Markup and Semantic Annotation (SemAnnot), 2004.

Suggested BibTeX entry:

@inproceedings{NiFrWe04a,
    author = {M. Nickles and T. Froehner and G.\ Wei{\ss}},
    booktitle = {Proceedings of the 4th {International} {W}orkshop on {K}nowledge {M}arkup and {S}emantic Annotation {(SemAnnot)}},
    title = {Social Annotation of Semantically Heterogeneous Knowledge},
    year = {2004}
}