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    "description": "Scrape Crossref, the world's largest DOI registry. Search 130M+ scholarly works, fetch by DOI, filter by date / type / journal, and pull authors, references, citation counts, ISSN, ORCIDs, and more.",
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            "description": "Drop works published before this date."
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            "description": "Drop works published after this date."
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              "book-chapter",
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            "minimum": 0,
            "maximum": 1000000,
            "type": "integer",
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            "title": "Sort by",
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              "is-referenced-by-count",
              "deposited",
              "indexed",
              "issued"
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            "description": "Crossref sort order.",
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            "title": "Sort order",
            "enum": [
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              "desc"
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            "title": "Include references",
            "type": "boolean",
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          },
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            "title": "User-Agent contact email",
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            "description": "Crossref's polite pool requires a contact email in User-Agent for higher rate limits.",
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            "title": "Max items",
            "minimum": 1,
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