FPOL systems generating counting languages
RAIRO. Informatique théorique, Tome 15 (1981) no. 2, pp. 161-173. 
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     author = {Ehrenfeucht, A. and Rozenberg, G.},
     title = {FPOL systems generating counting languages},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {161--173},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {2},
     year = {1981},
     mrnumber = {618453},
     zbl = {0469.68077},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1981__15_2_161_0/}
}
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Ehrenfeucht, A.; Rozenberg, G. FPOL systems generating counting languages. RAIRO. Informatique théorique, Tome 15 (1981) no. 2, pp. 161-173. http://archive.numdam.org/item/ITA_1981__15_2_161_0/

1. A. Ehrenfeucht and G. Rozenberg, On O-determined EOL languages, in A. LINDENMAYER and G. ROZENBERG, Eds., Automata, Languages, Development, North Holland, Amsterdam, 1975, pp. 191-202. | MR

2. G. T. Herman and G. Rozenberg, Developmental Systems and Languages, North Holland Publishing Company, Amsterdam, 1975. | MR | Zbl

3. H. Maurer, G. Rozenberg, A. Salomaa and D. Wood, On pure EOL Forms, R.A.I.R.O., Informatique Théorique, Vol. 13, No. 4, 1979. | Numdam | MR