Code behind the paper: "Identifying data sharing in biomedical literature." http://www.ncbi.nlm.nih.gov/pubmed/18998887
See also the slidedeck: http://www.slideshare.net/hpiwowar/piwowar-amia-2008-identifying-data-sharing-in-biomedical-literature
And this paper by other authors who built on this work: http://bioinformatics.oxfordjournals.org/content/27/23/3306.short