Geodesic
Theorem on the minorant. The denumerability of Maharam's problem
Matematičeskie zametki, Tome 21 (1977) no. 5, pp. 597-604.

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It is proved that on a normed denumerably complete Boolean algebra each continuous exterior measure majorizes at least one measure. With the aid of this result and of the Kelley numbers, Maharam's well-known problem on the seminormability and normability of Boolean algebras is transformed to a problem on the additive minorants of semimeasures continuous from one side on denumerable algebras. 
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     author = {V. N. Aleksyuk},
     title = {Theorem on the minorant. {The} denumerability of {Maharam's} problem},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_5_a2/}
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V. N. Aleksyuk. Theorem on the minorant. The denumerability of Maharam's problem. Matematičeskie zametki, Tome 21 (1977) no. 5, pp. 597-604. http://geodesic.mathdoc.fr/item/MZM_1977_21_5_a2/