@techreport{Hummels:2007,
      author        = "H. Hummels and Y. Bol and A. Röntgen",
      title         = "{Paying Taxes to Assist the Poor? Balancing Social and
                       Financial Interests}",
      number        = "DEEEP-REPORT-2018-057. DC-NPM-1",
      year          = "2013",
}