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https://books.google.com.co/books?id=m1DFcx3B0dYC&pg=PA106&lpg=PA106&dq=como+construir+un+simulador+de+lluvia&source=bl&ots=7TjQJCaBom&sig=kqR7yVJsjCfui3qsY0OhJrl3iX4&hl=es&sa=X&ei=nmsxVcDMIsGZyATw6IGIBw&ved=0CE0Q6AEwCw#v=onepage&q=como%20construir%20un%20simulador%20de%20lluvia&f=false

http://www.raco.cat/index.php/ect/article/viewFile/107395/134378