TY  - JOUR
AU  - A. van Rooij
AU  - W. Schikhof
TI  - On derivatives of functions defined on disconnected sets, I
JO  - Fundamenta Mathematicae
PY  - 1988
SP  - 83
EP  - 92
VL  - 131
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-131-2-83-92/
DO  - 10.4064/fm-131-2-83-92
LA  - en
ID  - 10_4064_fm_131_2_83_92
ER  -