@techreport{Akkerman:2052,
      author        = "Mark Akkerman",
      title         = "{Expanding the fortress}",
      number        = "DEEEP-REPORT-2019-002",
      year          = "2018",
      note          = "The executive summary is available in several languages
                       through this link:
                       https://www.tni.org/en/publication/expanding-the-fortress",
}