@article{MZ_1979__169_172879,
     author = {Mustafa A. Akcoglu and Ulrich Krengel},
     title = {A {Differentiation} {Theorem} in {Lp.}},
     journal = {Mathematische Zeitschrift},
     pages = {31--40},
     publisher = {mathdoc},
     volume = {169},
     year = {1979},
     zbl = {0394.47021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1979__169_172879/}
}