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  "name": "Adam Ostaszewski",
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      "title": "Teoria. Smoleńsk 2010",
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    {
      "title": "Azarra",
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      "first_published": "2021-09-05",
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    {
      "title": "Matematyka w ekonomii Modele i metody Tom 2",
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      "url": "https://www.kolczanksiazek.pl/adam-ostaszewski/matematyka-w-ekonomii-modele-i-metody-tom-2",
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      "title": "Matematyka w ekonomii Tom 1",
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      "first_published": "2012-01-01",
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}