BIBCYT http://bibcyt.ucla.edu.ve/cgi-win/be_alex.exe?Ultimo&Nombrebd=BIBCYT UCLA - Biblioteca de Ciencias y Tecnologia Felix Morales Bueno Kuldeep, Kumar P Principal Hillegersberg, Jos Van P Principal Communications of the ACM Vol: 47 pp.27-30.; 28cm.; il. Hillegersberg, Jos Van P Principal Zuidwijk, Rob P Principal Nunen, Jo van P Principal van Eijk, Diana P Principal Supporting return flows in the supply chain 44 pp.74-79.; 28cm.; il.