@article{Gelfond1986,
author = {Gelfond, M. and Przymusinska, H.},
journal = {Artificial Intelligence},
keywords = {classico},
mendeley-tags = {classico},
number = {3},
pages = {273--287},
publisher = {Elsevier},
title = {{Negation as failure:: Careful closure procedure}},
volume = {30},
year = {1986}
}

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