1. X. Hou, J. Appl. Radiat. Isotopes, 62 (2005) 871.
2. X. Hou, J. Radioanal. Nucl. Chem., 273 (2007) 43.
3. H. A. Das, Isotopenpraxis, 25 (1989) 344.
4. H. A. Das, J. Environ. Sci. Health, A29 (1994) 1843.
5. H. A. Das, X. Hou, Diffusion without and with reaction of a trace constituent out and in small solid spheres. Formulation and related use of radio-analysis, Report ECN, April 2008, Available upon request.