Andrea Frosini Giulia Simi The NP-completeness of a tomographical problem on bicolored domino tilings. 447-454 2004 319 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2004.02.004 db/journals/tcs/tcs319.html#FrosiniS04