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@article{DBLP:journals/jcss/AtzeniB90,
author = {Paolo Atzeni and
Maria Cristina De Bernardis},
title = {A New Interpretation for Null Values in the Weak Instance
Model},
journal = {J. Comput. Syst. Sci.},
volume = {41},
number = {1},
year = {1990},
pages = {25-43},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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