A metadata user reported finding "empty reference objects" for a number of DOIs. Based on the example he provided, it looks like those correspond to references that were deposited without keys.
For example, metadata for 10.1186/2008-2231-20-88 was last updated with submission 1355381104 which included these among its references.
A metadata user reported finding "empty reference objects" for a number of DOIs. Based on the example he provided, it looks like those correspond to references that were deposited without keys.
For example, metadata for 10.1186/2008-2231-20-88 was last updated with submission 1355381104 which included these among its references.
The results in the REST API here show all the references with citation key="-" as empty brackets http://api.crossref.org/works/10.1186/2008-2231-20-88
screenshots of the above also attached.