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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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/

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