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@article{MASLO_1983__33_1_a14, author = {Kelemenov\'a, Alica}, title = {Levels in {L-systems}}, journal = {Mathematica slovaca}, pages = {87--97}, publisher = {mathdoc}, volume = {33}, number = {1}, year = {1983}, mrnumber = {689284}, zbl = {0539.68044}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1983__33_1_a14/} }
Kelemenová, Alica. Levels in L-systems. Mathematica slovaca, Tome 33 (1983) no. 1, pp. 87-97. http://geodesic.mathdoc.fr/item/MASLO_1983__33_1_a14/