@article{ITA_2010__44_4_489_0,
     author = {Kolarz, Micha{\l}},
     title = {The code problem for directed figures},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {489--506},
     publisher = {EDP-Sciences},
     volume = {44},
     number = {4},
     year = {2010},
     doi = {10.1051/ita/2011005},
     mrnumber = {2775408},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita/2011005/}
}