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1. "The Sator Square: An Unsolved Cryptogram?" by David H. Kelley and Eugene R. Craine, published in "Cryptologia" (1980).
2. "The Sator-Rotas Square: A Reappraisal of the Evidence" by Roger Ling, published in "The Journal of Roman Studies" (1972).
3. "The Mystery of the Sator Square"by John Michell, included in his book "The Dimensions of Paradise" (1988).
4. "Pompeii: The Sator Square" by Robert Harris, in his book "Pompeii" (2003).
ns 15.158.61.48da2
