no. 1-2
Exceptional sets with respect to Lebesgue differentiation of functions in Sobolev spaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 1-2, pp. 113-130. 
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     author = {Marcus, Moshe},
     title = {Exceptional sets with respect to {Lebesgue} differentiation of functions in {Sobolev} spaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {113--130},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 1},
     number = {1-2},
     year = {1974},
     mrnumber = {376984},
     zbl = {0328.46031},
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Marcus, Moshe. Exceptional sets with respect to Lebesgue differentiation of functions in Sobolev spaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 1-2, pp. 113-130. http://archive.numdam.org/item/ASNSP_1974_4_1_1-2_113_0/

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