1. ENDESA;Brenes,1993
2. Rheem–Saiar;D'Andrea,1994
3. Consorcio Ferrex;Goiri,1993
4. Virutex-Ilko;Martı́nez,1992
5. Morrison, Allison, and Bowey, James: Hush Puppies Chile, INCAE Case Study #20200 (Spanish version). INCAE, Alajuela, Costa Rica. 1993.