On the complexity of schema inference from web pages in the presence of nullable data attributes.

Guizhen Yang I. V. Ramakrishnan Michael Kifer On the complexity of schema inference from web pages in the presence of nullable data attributes. 224-231 2003 conf/cikm/2003 CIKM http://doi.acm.org/10.1145/956863.956907 db/conf/cikm/cikm2003.html#YangRK03