@article{JIS_2005__8_2_a4,
     author = {Kitaev, Sergey and Mansour, Toufik and Vella, Antoine},
     title = {Pattern avoidance in matrices},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2005__8_2_a4/}
}