{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7119067#title"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Specific Polish letters",
          "Latin-script diacritics",
          "Cyrillic-script diacritics",
          "Greek-script diacritics"] } } }
