1. R. Zeisler and V. P. Guinn, eds.Nuclear Analytical Methods in the Life Sciences, Humana, Clifton, NJ, 1990.
2. S. A. E. Johansson,Nucl. Instrum. Methods Phys. Res. B75, 589 (1993).
3. S. Morita,Int. J. PIXE 2, No. 1, ix-xi (1992).
4. U. Lindh, ed.,Nucl. Instrum. Methods Phys. Res. B77 (1993).
5. K. Ishii, H. Orihara, and S. Morita, eds.Int. J. PIXE 2, No.3-4 (1992).