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Wikipedia − Sudoku
BBC News: The Puzzling Popularity of Su Doku
The Guardian: So you thought Sudoku came from the Land of the Rising Sun ...
Wayne Gould's website
Magic Square
Mathworld
kandaki.com (French)
magic−squares.de (English and German)
fratrazie.com (French)
Wikipedia − Magic Square
Lehonard Euler
Biography
Wikipedia − Euler
Other