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The content of the HyperLeda database results from the compilation of several thousands of articles published in astronomical journals and of larges surveys. This bibliography is stored in the table bref04.
The bibliographic can be queried directly and is used to display details about a given source when one of the compilation is accessed.
The bibcode is given when it exists. And in the rare cases where no code was defined (data acquired privately; internal contribution by the HyperLeda team), the field is left NULL, or an internal code prefixed with the character '*' is used.