1. http://www.ncgc.nih.gov/guidance/manual_toc.html 2010
2. Simultaneous analysis of families of sigmoidal curves: application to bioassay, radioligand assay, and physiological dose-response curves;De Lean;American Journal of Physiology,1978
3. D-optimal designs for logistic models with three and four parameters;Li;Journal of Statistical Planning and Inference,2008
4. Optimal design for estimating parameters of the 4-parameter Hill model;Khinkis;Nonlinearity in Biology, Toxicology, and Medicine,2003