TY  - JOUR
AU  - Dassow, Jürgen
AU  - Mitrana, Victor
AU  - Păun, Gheorghe
AU  - Stiebe, Ralf
TI  - On differentiation functions, structure functions, and related languages of context-free grammars
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 2004
SP  - 257
EP  - 267
VL  - 38
IS  - 3
PB  - EDP-Sciences
UR  - http://www.numdam.org/articles/10.1051/ita:2004013/
DO  - 10.1051/ita:2004013
LA  - en
ID  - ITA_2004__38_3_257_0
ER  -