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@article{DBLP:journals/jacm/Paola69a,
author = {Robert A. Di Paola},
title = {The Recursive Unsolvability of the Decision Problem for
the Class of Definite Formulas},
journal = {J. ACM},
volume = {16},
number = {2},
year = {1969},
pages = {324-327},
ee = {http://doi.acm.org/10.1145/321510.321524},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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