@Article{ElGolliConanGuezRossi04JSDA,
  author = 	 {El Golli, A\"{\i}cha and Conan-Guez, Brieuc and Rossi, Fabrice},
  title = 	 {Self Organizing Map and Symbolic Data},
  journal = 	 {Journal of Symbolic Data Analysis},
  year = 	 2004,
  volume = 	 2,
  number = 	 1,
  month = 	 {November},
  note = 	 {\url{http://apiacoa.org/publications/2004/som-jsda04.pdf}}
}