Many-valued mappings and Borel sets.~I.~II.
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 23 (1970), pp. 277-301.

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     author = {M. M. Choban},
     title = {Many-valued mappings and {Borel} {sets.~I.~II.}},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {277--301},
     publisher = {mathdoc},
     volume = {23},
     year = {1970},
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     url = {http://geodesic.mathdoc.fr/item/MMO_1970_23_a7/}
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M. M. Choban. Many-valued mappings and Borel sets.~I.~II.. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 23 (1970), pp. 277-301. http://geodesic.mathdoc.fr/item/MMO_1970_23_a7/