A combinatorial arrangement was proposed by T. G. Room (1955). Archbold and Johnson (1958) gave a method of construction for these arrangements (which they called Room's squares) and suggested an application to experimental design. The purpose of the present communication is to rectify an error in the analysis given by Archbold and Johnson in the above paper.
K. R. Shah. "Analysis of Room's Square Design." Ann. Math. Statist. 41 (2) 743 - 745, April, 1970. https://doi.org/10.1214/aoms/1177697128