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@article{DBLP:journals/jacm/HuntS78,
author = {Harry B. Hunt III and
Thomas G. Szymanski},
title = {Lower Bounds and Reductions Between Grammar Problems},
journal = {J. ACM},
volume = {25},
number = {1},
year = {1978},
pages = {32-51},
ee = {http://doi.acm.org/10.1145/322047.322051},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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