Serra, P. (2025). On the number of words of $N=3 \,n$ letters with a three-letter alphabet.
Chicago Style (17th ed.) CitationSerra, Pablo. On the Number of Words of $N=3 \,n$ Letters with a Three-letter Alphabet. 2025.
MLA (9th ed.) CitationSerra, Pablo. On the Number of Words of $N=3 \,n$ Letters with a Three-letter Alphabet. 2025.
Warning: These citations may not always be 100% accurate.