@article{DietrichRossowPohlmann2017,
  author    = {Christian J. Dietrich and Christian Rossow and Norbert Pohlmann},
  title     = {E-mail Spam Threats and Mitigation. Recent research results},
  journal   = {ENISA Quarterly},
  volume    = {4},
  number    = {2},
  pages     = {3 -- 4},
  url       = {https://www.enisa.europa.eu/publications/eqr-archive/issues/eqr-q2-2008-vol.-4-no.-2},
  year      = {2017},
}