{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7340956#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Digital geometry",
          "Curves",
          "Elementary shapes",
          "Display technology",
          "Conic sections",
          "Algebraic curves"] } } }
