1. S.-J. Heselius, Particle Beam Penetration in Nitrogen Gas and Water Targets, Turku PET Centre, Finland, WWTTC97.
2. FEMAP, Structural Dynamics Research Corp., Exton, PA.
3. CFDesign, Blue Ridge Numerics, VA.
4. Developed by Meiring Nortier, Isotope Production Facility, LANL.