Shutaro Inoue, Yosuke Sato. A Mathematical Hierarchy of Sudoku Puzzles and Its Computation by Boolean Gröbner Bases. In Gonzalo A. Aranda-Corral, Jacques Calmet, Francisco J. Martín-Mateos, editors, Artificial Intelligence and Symbolic Computation - 12th International Conference, AISC 2014, Seville, Spain, December 11-13, 2014. Proceedings. Volume 8884 of Lecture Notes in Computer Science, pages 88-98, Springer, 2014. [doi]
Abstract is missing.