Phattrawan Tongkumchum.
Two-Dimensional Box Plot.
In Songklanakarin Journal of Science and Technology, vol. 27, no. 4, pp. 859--866, 2005.

Bibtex:

@Article{        tongkumchum:2005:TDBP,
  author = 	 "Phattrawan Tongkumchum",
  title = 	 "Two-Dimensional Box Plot",
  journal = 	 "Songklanakarin Journal of Science and Technology",
  year = 	 "2005",
  volume = 	 "27",
  number = 	 "4",
  pages = 	 "859--866",
}