{
    "query": {
        "category": "Mathematics",
        "publication_date": "1991-02",
        "nr_of_items": 2
    },
    "items": [
        {
            "title": "Advanced Mathematical Methods",
            "subtitle": null,
            "author": "Adam Ostaszewski",
            "isbn": "9780521289641",
            "publisher": "Cambridge University Press",
            "link_to_publisher": "https:\/\/www.cambridge.org\/universitypress\/subjects\/mathematics\/mathematical-modelling-and-methods\/advanced-mathematical-methods?format=PB"
        },
        {
            "title": "Probability with Martingales",
            "subtitle": null,
            "author": "David Williams",
            "isbn": "9780521406055",
            "publisher": "Cambridge University Press",
            "link_to_publisher": "https:\/\/www.cambridge.org\/core\/books\/probability-with-martingales\/B4CFCE0D08930FB46C6E93E775503926"
        }
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