Kazuki Jimbo Hiroya Takamura Manabu Okumura Solving Crossword Puzzles Using Extended Potts Model. 39-47 2008 JSAI http://dx.doi.org/10.1007/978-3-642-00609-8_5 conf/jsai/2008 db/conf/jsai/jsai2008.html#JimboTO08