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Classes of Split-plot Response Surface Designs for Equivalent Estimation. This article is a U.S. Government work and is in the public domain in the U.S.A.
Parker, Peter A., (2006)
Response Surface Designs Within a Split-Plot Structure
Vining, G.Geoffrey, (2005)
Exact Inference for Response Surface Designs Within a Split-Plot Structure
Vining, G.Geoffrey, (2008)