{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC1994780#title"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Organic acids",
          "Tandem mass spectrometry",
          "Biomolecules",
          "Nucleic acids",
          "Ion source",
          "Genomics",
          "Origin of life"] } } }
