@article{10_4064_fm_151_1_21_38,
     author = {S. Mukhopadhyay and S. Mitra},
     title = {An extension of a theorem of {Marcinkiewicz} and {Zygmund} on differentiability},
     journal = {Fundamenta Mathematicae},
     pages = {21--38},
     publisher = {mathdoc},
     volume = {151},
     number = {1},
     year = {1996},
     doi = {10.4064/fm-151-1-21-38},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-151-1-21-38/}
}