[1]
Wang, B.-S., Wang, X.-J. and Gong, L.-K. 2009. The Construction of a Williams Design and Randomization in Cross-Over Clinical Trials Using SAS. Journal of Statistical Software, Code Snippets. 29, 1 (Feb. 2009), 1–10. DOI:https://doi.org/10.18637/jss.v029.c01.