An unsolvable problem of elementary number theory. Church, A. American journal of mathematics, 58(2):345–363, 1936.
bibtex   
@article{church_unsolvable_1936,
	title = {An unsolvable problem of elementary number theory},
	volume = {58},
	issn = {0002-9327},
	number = {2},
	journal = {American journal of mathematics},
	author = {Church, A.},
	year = {1936},
	pages = {345--363}
}
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