Dear Bautista.
I wrote a paper to address this subject, may be it could be useful for you.
visit the url:
http://www.arch.usyd.edu.au/kcdc/journal/vol3/dcnet/avarena/text_8.html
the full paper is at
http://www.arch.usyd.edu.au/kcdc/journal/vol3/dcnet/avarena
Any question, please send me a personal email.
Dr José Aravena-Reyes
Federal University of Juiz de Fora
Fundamental of Design Department
BRazil
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