Directed figure codes are decidable. - Michal Kolarz; Wlodzimierz Moczurad (Discret. Math. Theor. Comput. Sci., 2009)

Directed Figure Codes: Decidability Frontier. - Michal Kolarz (Discret. Math. Algorithms Appl., 2010)

The code problem for directed figures. - Michal Kolarz (RAIRO Theor. Informatics Appl., 2010)

Multiset, Set and Numerically Decipherable Codes over Directed Figures. - Michal Kolarz; Wlodzimierz Moczurad (IWOCA, 2012)