@article{ITA_1993__27_1_49_0, author = {Brandenburg, Franz J. and Dassow, J\"urgen}, title = {Efficient reductions of picture words}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, pages = {49--56}, publisher = {EDP-Sciences}, volume = {27}, number = {1}, year = {1993}, mrnumber = {1213420}, zbl = {0770.68081}, language = {en}, url = {http://www.numdam.org/item/ITA_1993__27_1_49_0/} }