http://www.umng.edu.co/revcieco/2007/julio.2007/VOLXV1/9.VIABLE%20ISO.pdf
http://books.google.com.co/books?id=6i4b1F0zX90C&pg=PA424&dq=REVERSE+LOGISTIC#PPP1,M1
http://books.google.com.co/books?id=6Iu_M5JCngcC&pg=PT1&dq=REVERSE+LOGISTIC#PPP1,M1