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@article{MZ_1935__39_168557, author = {M.D. and Pollard, S. Kennedy}, title = {Upper and lower integrals}, journal = {Mathematische Zeitschrift}, pages = {432--454}, publisher = {mathdoc}, volume = {39}, year = {1935}, zbl = {60.0205.02}, url = {http://geodesic.mathdoc.fr/item/MZ_1935__39_168557/} }
M.D. and Pollard, S. Kennedy. Upper and lower integrals. Mathematische Zeitschrift, Tome 39 (1935), pp. 432-454. http://geodesic.mathdoc.fr/item/MZ_1935__39_168557/