{
    "query": {
        "category": "Mathematics",
        "publication_date": "1990-01",
        "nr_of_items": 2
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    "items": [
        {
            "title": "Essential Results of Functional Analysis",
            "subtitle": null,
            "author": "Zimmer, Robert J.",
            "isbn": "9780226983387",
            "publisher": "University of Chicago Press",
            "link_to_publisher": "https:\/\/press.uchicago.edu\/ucp\/books\/book\/chicago\/E\/bo3774514.html"
        },
        {
            "title": "Mathematics and the Unexpected",
            "subtitle": null,
            "author": "Ekeland, Ivar",
            "isbn": "9780226199900",
            "publisher": "University of Chicago Press",
            "link_to_publisher": "https:\/\/press.uchicago.edu\/ucp\/books\/book\/chicago\/M\/bo4432961.html"
        }
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}