- S.S. Chirayath , R. Elmore, G. Hollenbeck, N.G. Chandregowda, W.S. Charlton, R. Metcalf, and J.C. Ragusa, "Proliferation Resistance Analysis And Evaluation Tool for Observed Risk (PRAETOR) Methodology", Journal of Nuclear Materials Management, 43, 2 (2015).
- R. Metcalf, "New Tool for Proliferation Resistance Evaluation Applied to Uranium and Thorium Fueled Fast Reactor Fuel Cycles", M.S. Thesis, Texas A & M University, May 2009.
- R. Metcalf, A. Bevill, W. Charlton, R. Bean, "Safeguards Envelope: Previous Work and Examples", 49th Annual INMM Meeting, Nashville, TN, July 13-17, 2008.
- R. Metcalf, J. Ragusa, R. Bean , "Safeguards Envelope: The First Steps", 8th International Conference on Facility Operations - Safeguards Interface, Portland, OR, March 30 - April 4, 2008.
- S. Chirayath, R. Metcalf, J. Ragusa, and P. Nelson, "Assessment of Proliferation Resistance Requirements for Fast-Reactor Fuel-Cycle Facilities", 8th International Conference on Facility Operations - Safeguards Interface, Portland, Oregon, March 30 - April 4, 2008.