{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7324036#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Smoked food",
          "20th-century American mathematicians",
          "Lattice theory",
          "Software using the BSD license",
          "University of Königsberg faculty",
          "Proof assistants"] } } }
