1. Enraf-Nonius (1994). CAD-4 EXPRESS. Enraf-Nonius, Delft, The Netherlands.
2. N-(2-Pyridylmethyl)phthalimide
3. Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany.
4. A semi-empirical method of absorption correction
5. Petersen, U., Krebs, A. & Schenke, T. (1993). Eur. Patent Appl. EP 92 122 058.