@article{JIS_2014__17_8_a4,
     author = {Bullington, Grady and Eroh, Linda and Winters, Steven J.},
     title = {Prisoners and guards on rectangular boards},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {17},
     number = {8},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2014__17_8_a4/}
}