[
  {
    "id": "ef-20-1",
    "type": "article-journal",
    "title": "The upper bound revisited",
    "author": [
      {
        "given": "Lloyd M.",
        "family": "Robeson"
      }
    ],
    "container-title": "Journal of Membrane Science",
    "issued": {
      "date-parts": [
        [
          2008
        ]
      ]
    },
    "DOI": "10.1016/j.memsci.2008.04.030",
    "URL": "https://doi.org/10.1016/j.memsci.2008.04.030"
  },
  {
    "id": "ef-20-2",
    "type": "article-journal",
    "title": "Triptycene Induced Enhancement of Membrane Gas Selectivity for Microporous Tröger's Base Polymers",
    "author": [
      {
        "given": "Mariolino",
        "family": "Carta"
      },
      {
        "given": "Matthew",
        "family": "Croad"
      },
      {
        "given": "Richard",
        "family": "Malpass‐Evans"
      },
      {
        "given": "Johannes C.",
        "family": "Jansen"
      },
      {
        "given": "Paola",
        "family": "Bernardo"
      },
      {
        "given": "Gabriele",
        "family": "Clarizia"
      },
      {
        "given": "Karel",
        "family": "Friess"
      },
      {
        "given": "Marek",
        "family": "Lanč"
      },
      {
        "given": "Neil B.",
        "family": "McKeown"
      }
    ],
    "container-title": "Advanced Materials",
    "issued": {
      "date-parts": [
        [
          2014
        ]
      ]
    },
    "DOI": "10.1002/adma.201305783",
    "URL": "https://doi.org/10.1002/adma.201305783"
  },
  {
    "id": "ef-20-3",
    "type": "article-journal",
    "title": "Basis of Permeability/Selectivity Tradeoff Relations in Polymeric Gas Separation Membranes",
    "author": [
      {
        "given": "Benny D.",
        "family": "Freeman"
      }
    ],
    "container-title": "Macromolecules",
    "issued": {
      "date-parts": [
        [
          1999
        ]
      ]
    },
    "DOI": "10.1021/ma9814548",
    "URL": "https://doi.org/10.1021/ma9814548"
  }
]