Two weeks ago, a paper by Peter Ertl was published about Molecular structure input on the web (doi:10.1186/1758-2946-2-1). In this paper, he discusses the state of things and describes his contribution to this field, the JME Molecule Editor. The article also cites the CDK, but only the website and not one of the two papers (doi:10.1021/ci025584y, or doi:10.2174/138161206777585274). This is not an isolated case, but a common pattern. In principle, the proper work is cited, and nothing is wrong. Practically it means, that a citation to the CDK website does not show up in the citation network. This is not a problem caused by these papers, but merely by the nature current citation databases work: they only count citations between journal articles, and only sometimes extend to books or conference abstracts.
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