Upper and lower integral difference functionals, closest approximations, and integrability
Rendiconti del Seminario Matematico della Università di Padova, Volume 52 (1974), p. 1-24
@article{RSMUP_1974__52__1_0,
     author = {Appling, William D. L.},
     title = {Upper and lower integral difference functionals, closest approximations, and integrability},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {52},
     year = {1974},
     pages = {1-24},
     zbl = {0325.28006},
     mrnumber = {404565},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1974__52__1_0}
}
Appling, William D. L. Upper and lower integral difference functionals, closest approximations, and integrability. Rendiconti del Seminario Matematico della Università di Padova, Volume 52 (1974) pp. 1-24. http://www.numdam.org/item/RSMUP_1974__52__1_0/

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