Geodesic
Approximation and differential properties of measurable sets
Sbornik. Mathematics, Tome 49 (1984) no. 2, pp. 401-418

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In this paper the authors establish approximation properties of measurable sets, which are then applied to study the differential properties of sets connected with the notion of points of density. A refinement of the well-known Lebesgue theorem on points of density of measurable sets is obtained. Bibliography: 7 titles. 
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     author = {A. N. Zhdanov and E. A. Sevast'yanov},
     title = {Approximation and differential properties of measurable sets},
     journal = {Sbornik. Mathematics},
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     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1984_49_2_a7/}
}
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A. N. Zhdanov; E. A. Sevast'yanov. Approximation and differential properties of measurable sets. Sbornik. Mathematics, Tome 49 (1984) no. 2, pp. 401-418. http://geodesic.mathdoc.fr/item/SM_1984_49_2_a7/