[
  {
    "file": "kitaoka.pdf",
    "url": "https://sigma-journal.com/2022/091/sigma22-091.pdf",
    "sha256": "20f84c4fc25d5088ee61abbf29426f085a93d051edd2e9e03a51737b63b5f475"
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    "url": "https://www.uni-muenster.de/FB10/mjm/vol_15/mjm_vol_15_12.pdf",
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