[
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          1991
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  {
    "id": "ef-22-2",
    "type": "article-journal",
    "title": "Measurement of gravitational acceleration by dropping atoms",
    "author": [
      {
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        "family": "Peters"
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  {
    "id": "ef-22-3",
    "type": "article-journal",
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    "author": [
      {
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]