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Q: How do I filter results to only refereed articles?
Use a filter parameter on the property field. e.g., &filter=property:refereed.
Q: How can I see the set of possible values for the property field within a set of results?
That's what the facet parameter is for. e.g., &facet=property, will append to the api response a list of distinct property field values and the counts of how often they each appear in the corresponding result set.
Q: Can I retrieve citation or reference data via the api?
Yes! Just not in the way you might expect. The data about a particular record fetched via the /api/search or /api/record endpoints will not contain references or citations, but you can get that data using the special query syntax citations(<query>) or references(<query>).
For example, a search request using &q=references(bibcode:2011ApSSP...1..125H) will return a result set consisting of the reference list for 2011ApSSP...1..125.