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+@article{KR65,
+  title={A general theorem on selectors},
+  author={Kuratowski, Kazimierz and Ryll-Nardzewski, Czes{\l}aw},
+  journal={Bull. Acad. Polon. Sci. S{\'e}r. Sci. Math. Astronom. Phys},
+  volume={13},
+  number={6},
+  pages={397--403},
+  year={1965}
+}