Tetrad (geometry puzzle) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Tetrad (geometry puzzle)" in English language version.

Last modified: 10:13:22, 16 June 2026 (UTC)

Ref.Un. Ref.Website

Global rank English rank

31books.google.com

3^rd place

3^rd place

low place

low place

books.google.com (Global: 3^rd place; English: 3^rd place)

Martin Gardner, Penrose Tiles to Trapdoor ciphers, 1989, p.121-123

trump.de (Global: low place; English: low place)

Further Questions about Tetrads by Walter Trump