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    • Generating highly balanced sudoku problems as hard problems 

      Ansótegui Gil, Carlos José; Béjar Torres, Ramón; Fernàndez Camon, César; Gomes, Carla; Mateu Piñol, Carles (Springer, 2011)
      Sudoku problems are some of the most known and enjoyed pastimes, with a never diminishing popularity, but, for the last few years those problems have gone from an entertainment to an interesting research area, a twofold ...