TY  - JOUR
AU  - R. Fleissner
AU  - R. J. O'Malley
TI  - Conditions implying the summability of approximate derivatives
JO  - Colloquium Mathematicum
PY  - 1979
SP  - 257
EP  - 263
VL  - 41
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-41-2-257-263/
DO  - 10.4064/cm-41-2-257-263
LA  - en
ID  - 10_4064_cm_41_2_257_263
ER  -