@article{M2AN_1973__7_1_45_0, author = {Wood, Derick}, title = {Bicolored digraph grammar systems}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique}, volume = {7}, year = {1973}, pages = {45-52}, mrnumber = {388874}, zbl = {0262.68014}, language = {en}, url = {http://dml.mathdoc.fr/item/M2AN_1973__7_1_45_0} }
Wood, Derick. Bicolored digraph grammar systems. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 7 (1973) pp. 45-52. http://gdmltest.u-ga.fr/item/M2AN_1973__7_1_45_0/
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