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2. On a problem of Bagemihl and Erdös concerning the distribution of zeros of an annular function;Barth;J. reine u angew. Math.,1969
3. Entire functions mapping countable dense subsets of the reals onto each other monotonically;Barth;J. London Math. Soc.,1970
4. Entire functions mapping arbitrary countable dense sets and their complements onto each other;Barth;J. London. Math. Soc.,1972
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