@article{DBLP:journals/tcs/SudboroughW85,
author = {Ivan Hal Sudborough and
Emo Welzl},
title = {Complexity and Decidability for Chain Code Picture Languages},
journal = {Theor. Comput. Sci.},
volume = {36},
year = {1985},
pages = {173-202},
ee = {http://dx.doi.org/10.1016/0304-3975(85)90041-6},
bibsource = {DBLP, http://dblp.uni-trier.de}
}