This article shows some of the results of a computer search for regular nine-squares. My earlier article on eight-squares reported on a search confined to solid all-lowercase eight-letter words. Standards had to be lowered for the nine-square search, and I included capitalised terms, hyphenated words and multiple-word phrases.
"A Collection of Nine-Squares,"
Word Ways: Vol. 30
, Article 4.
Available at: https://digitalcommons.butler.edu/wordways/vol30/iss1/4