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            "title": "Aspects of Quantum Field Theory in Curved Spacetime",
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            "author": "Stephen A. Fulling",
            "isbn": "9780521377683",
            "publisher": "Cambridge University Press",
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            "title": "Combinatorial Group Theory",
            "subtitle": "A Topological\u00a0Approach",
            "author": "Daniel E. Cohen",
            "isbn": "9780521349369",
            "publisher": "Cambridge University Press",
            "link_to_publisher": "https:\/\/www.cambridge.org\/universitypress\/subjects\/mathematics\/algebra\/combinatorial-group-theory-topological-approach?format=PB"
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