1. Hahn , G.J. T.J. Boardman “Continuous Quality Improvement. Part 1,” CHEMTECH June, 1987 346 349
2. Hahn , G.J. T.J. Boardman “Statistical Approaches to Quality Improvement. Part 2,” CHEMTECH, July 1987 412 417
3. Deming , S.N. “Quality by Design. Part 1,” CHEMTECH September, 1988 560 566
4. Deming , S.N. “Quality by Design. Part 2,” CHEMTECH January, 1989 52 58