On sliding block puzzles

Reference:

Filip Karlemo and Patric R.J. Östergård. On sliding block puzzles. Journal of Combinatorial Mathematics and Combinatorial Computing, 34(1):97–107, 2000.

Suggested BibTeX entry:

@article{KarlemoOstergard:sliding,
    author = {Filip Karlemo and Patric R.J. \"Osterg\aard},
    journal = {Journal of Combinatorial Mathematics and Combinatorial Computing},
    number = {1},
    pages = {97--107},
    title = {On sliding block puzzles},
    volume = {34},
    year = {2000},
}