Epp-SN-87

@article{Epp-SN-87,
title = {On the NP-completeness of cryptarithms},
author = {David Eppstein},
journal = {SIGACT News},
publisher = {ACM},
volume = {18},
number = {3},
pages = {38--40},
year = {1987},
url = {http://www.ics.uci.edu/~eppstein/pubs/Epp-SN-87.pdf}}

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