{
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  "record": {
    "abstract": "We briefly review superstring theories, highlighting the important concepts,\ndevelopments, and open problems of the subject.",
    "arxiv_id": "physics/0605105",
    "authors": [
      "Constantin Bachas",
      "Jan Troost"
    ],
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    "title": "Superstring theories",
    "url": "https://arxiv.org/abs/physics/0605105"
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