1. European Pharmacopoeia, V 2.9.5: uniformity of single dose content, Govi-Verlag, Stuttgart, 1997, pp. 142–143.
2. M. Ridley, D.E. Cumpstey, European Patent EP0887638 A 19981230, 1999.
3. CAMO AS, The Unscrambler 7.0 User's Manual, Trondheim, Norway, 1998.
4. Chemometrie. Statistik und computereinsatz in der analytik, Weinheim: VCH;Otto,1997
5. Chemometrics: a Textbook;Massart,1988