{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC6378949#title"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Unix SUS2008 utilities",
          "Standard Unix programs",
          "Virology",
          "Environment variables",
          "Sociolinguistics"] } } }
