TY  - JOUR
AU  - Arto Salomaa
TI  - On some families of formal languages obtained by regulated derivations
JO  - Annales Fennici Mathematici
PY  - 1971
VL  - 471-500
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1971.479/
DO  - 10.5186/aasfm.1971.479
LA  - en
ID  - AFM_1971_471-500_a21
ER  -