TY  - JOUR
AU  - K. Krzyżewski
TI  - On the approximate derivative of superposition
JO  - Commentationes Mathematicae
PY  - 1965
SP  -  123
EP  - 127
VL  - 9
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v9i2.5540/
DO  - 10.14708/cm.v9i2.5540
LA  - pl
ID  - 10_14708_cm_v9i2_5540
ER  -