I am looking for an API/software (free or open source) able to download metadata on scientific articles (economics) according to a set of queries (e.g., words in the title/abstract, keywords, JEL code, year of publication, and journal).
This has to be seen in the perspective of a systematic literature review.
The IDEAS/Repc (multisource) database contains the information I am looking for, however, I do not get how to systematically download the data.