TY  - JOUR
AU  - M. Kuczma
TI  - On squares of differentiable functions
JO  - Annales Polonici Mathematici
PY  - 1969
SP  - 229
EP  - 237
VL  - 22
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-22-2-229-237/
DO  - 10.4064/ap-22-2-229-237
LA  - en
ID  - 10_4064_ap_22_2_229_237
ER  -