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THE DESIGN OF OPTIMUM MULTIFACTORIAL EXPERIMENTS Get access R. L. PLACKETT, R. L. PLACKETT Search for other works by this author on: Oxford Academic Google Scholar J. P. BURMAN J. P. BURMAN Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 33, Issue 4, June 1946, Pages 305–325, https://doi.org/10.1093/biomet/33.4.305 Published: 01 June 1946
Plackett et al. (Tue,) studied this question.