TY  - JOUR
AU  - Zajíček, Luděk
TI  - On approximate Dini derivates and one-sided approximate derivatives of arbitrary functions
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1981
SP  - 549
EP  - 560
VL  - 22
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1981__22_3_a8/
LA  - en
ID  - CMUC_1981__22_3_a8
ER  -