Geodesic
Criteria for the existence of derivatives in $L^p$
Sbornik. Mathematics, Tome 2 (1967) no. 1, pp. 35-55 
Yu. A. Brudnyi. Criteria for the existence of derivatives in $L^p$. Sbornik. Mathematics, Tome 2 (1967) no. 1, pp. 35-55. http://geodesic.mathdoc.fr/item/SM_1967_2_1_a3/
@article{SM_1967_2_1_a3,
     author = {Yu. A. Brudnyi},
     title = {Criteria for the existence of derivatives in $L^p$},
     journal = {Sbornik. Mathematics},
     pages = {35--55},
     year = {1967},
     volume = {2},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_2_1_a3/}
}
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