Disk Disposal and Data Recovery
Data Recovery: The Current State-of-the-Art, ActionFront Data Recovery Labs, August 2005.
Secure Deletion of Data from Magnetic and Solid-State Memory, Peter Gutmann, Proceedings of the Sixth Usenix Security Symposium, 1996. 
Hard Drive Disposal: The Overlooked Confidentiality Exposure, FInancial Perspectives, IBM White Paper, November 2003.
Byteprints: A Tool to Gather Digital Evidence, Sriranjani Sitaraman, Srinivasan Krishnamurthy and S. Venkatesan, Proceedings of the International Conference on Information Technology (ITCC 2005), Las Vegas, Nevada, USA, April 4 - 6, 2005
Kulesh Shanmugasundaram and Nasir Memon, Automatic Reassembly of Document Fragments via Context Based Statistical Models, http://citeseer.ist.psu.edu/shanmugasundaram03automatic.html