Geodesic
On the concepts of lower and upper functions
Differencialʹnye uravneniâ, Tome 16 (1980) no. 10, pp. 1750-1759.

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     author = {L. A. Lepin},
     title = {On the concepts of lower and upper functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1750--1759},
     publisher = {mathdoc},
     volume = {16},
     number = {10},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_10_a2/}
}
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L. A. Lepin. On the concepts of lower and upper functions. Differencialʹnye uravneniâ, Tome 16 (1980) no. 10, pp. 1750-1759. http://geodesic.mathdoc.fr/item/DE_1980_16_10_a2/