Alnosaier, Waseem, and David Birkes. “Conditions Under Which the Kenward-Roger Approximate Test is an Exact F Test”. Thailand Statistician 24, no. 2 (March 29, 2026): 494–504. accessed September 11, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/264632.