@techreport{TjusilaBesanconTurneretal.2023, author = {Gennesaret Tjusila and Mathieu Besancon and Mark Turner and Thorsten Koch}, title = {How Many Clues To Give? A Bilevel Formulation For The Minimum Sudoku Clue Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {23-15}, language = {eng}, year = {2023} }