%0 Journal Article
%A Appling, William D. L.
%T Upper and lower integral difference functionals, closest approximations, and integrability
%J Rendiconti del Seminario Matematico della Università di Padova
%D 1974
%P 1-24
%V 52
%I Seminario Matematico of the University of Padua
%U http://archive.numdam.org/item/RSMUP_1974__52__1_0/
%G en
%F RSMUP_1974__52__1_0