TY  - JOUR
AU  - Zajíček, Luděk
TI  - On the intersection of the sets of the right and left internal approximate derivatives
JO  - Czechoslovak Mathematical Journal
PY  - 1973
SP  - 629
EP  - 634
VL  - 23
IS  - 4
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1973.101205/
DO  - 10.21136/CMJ.1973.101205
LA  - en
ID  - 10_21136_CMJ_1973_101205
ER  -