1. Some methods of controlling the tree search in chess programs;Adelson-Velsky;Artificial Intelligence,1975
2. Sokoban is PSPACE-complete;Culberson,1999
3. Pattern databases;Culberson;Comput. Intelligence,1998
4. SOKOBAN and other motion planning problems;Dor,1995
5. Boosting combinatorial search through randomization;Gomes,1998