@TechReport{ cmla-2004-13,
  author = 	 {F. Cao and J. Delon and A. Desolneux and P. Mus{\'e} and F. Sur},
  title = 	 {An {\em a contrario} approach to hierarchical clustering validity assessment},
  institution =  {CMLA, ENS Cachan},
  year = 	 {2004},
  month =        {September},
  number = 	 {2004-13},
  type =         {Research Report}
}