Diagenesis and fracture development in the Bakken Formation, Williston Basin : implications for reservoir quality in the middle member / by Janet K. Pitman, Leigh C. Price, and Julie A. LeFever
Also available via Internet from the USGS Web site. Address as of 1-14-02: http://greenwood.cr.usgs.gov/pub/ppapers/p1653/p1653.pdf; current access is available via PURL.