@article{Drgas-Burchardt:2006,
  author  = "E. Drgas-Burchardt",
  title   = "A note on joins of additive hereditary graph properties",
  journal = "Discussiones Mathematicae : Graph Theory",
  volume  = "Vol. 26",
  number  = "no 3",
  pages   = "413--418",
  year    = "2006",
}