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@article{MAN_1968__176_161691, author = {P. HARTMAN}, title = {On {Limits} of {Riemann} {Sums} and the {Range} of {Integrals.}}, journal = {Mathematische Annalen}, pages = {208--220}, publisher = {mathdoc}, volume = {176}, year = {1968}, zbl = {0174.45202}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__176_161691/} }
P. HARTMAN. On Limits of Riemann Sums and the Range of Integrals.. Mathematische Annalen, Tome 176 (1968), pp. 208-220. http://geodesic.mathdoc.fr/item/MAN_1968__176_161691/