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        "doi": "https://doi.org/10.1007/bf01386390",
        "title": "A note on two problems in connexion with graphs",
        "publication_date": "1959-12-01",
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    {
        "id": "https://openalex.org/W1968778433",
        "doi": "https://doi.org/10.1145/320893.320896",
        "title": "Formal Procedures for Connecting Terminals with a Minimum Total Wire Length",
        "publication_date": "1957-10-01",
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    {
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        "doi": "https://doi.org/10.1090/s0002-9939-1956-0078686-7",
        "title": "On the shortest spanning subtree of a graph and the traveling salesman problem",
        "publication_date": "1956-02-01",
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    }
]