TY  - JOUR
AU  - Appling, William D. L.
TI  - Upper and lower integral difference functionals, closest approximations, and integrability
JO  - Rendiconti del Seminario Matematico della Università di Padova
PY  - 1974
SP  - 1
EP  - 24
VL  - 52
PB  - Seminario Matematico of the University of Padua
UR  - http://archive.numdam.org/item/RSMUP_1974__52__1_0/
LA  - en
ID  - RSMUP_1974__52__1_0
ER  -