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3. T. Bartoszyński, Additivity of measure implies additivity of category, Transactions of the American Mathematical Society 281 (1984), 209–213.
4. T. Bartoszyński, On covering of the real line by null sets, Pacific Journal of Mathematics 131 (1988), 1–12.
5. T. Bartoszyński, H. Judah, On the cofinality of the smallest covering of the real line by meager sets, Journal of Symbolic logic 54 (1989), 828–832.