1. Achenbach W, Lieber K, Moormann J (2006) Six Sigma in der Finanzbranche. Bankakademie-Verlag, Frankfurt a.M
2. Adams R, Warner P, Hubbard B, Goulding T (2004) Decreasing turnaround time between general surgery cases. JONA 34:140–148
3. Al-Aoumar R (2007) Prestigious three. Ind Eng 39:39–42
4. Almario VM (2005) Six sigma and the pharmaceutical industry. Available at: http://www.ibpassociation.org/IBPA_articles/oct2005issue/SixSigmaPharmaceuticalIndustry.doc . Accessed 3 Apr 2008
5. Anbari FT, Kwak YH (2004) Success factors in managing six sigma projects. In: Project management institute research conference, London