1. Ackoff RL (1962) Scientific method: optimizing applied research decisions. Wiley, New York
2. Aldana Valdés E, Reyes Alvarado A (2004) Disolver problemas. Universidad de los Andes, Bogotá
3. Awwa Research Foundation (2003) Effects of activated carbon characteristics on organic contaminant removal. American Water Works Association, Denver
4. Beer S (1994) Beyond dispute: the invention of team syntegrity. Wiley, Chichester
5. Bergvall-Kåreborn B, Mirijamdotter A, Basden A (2004) Basic principles of SSM modeling: an examination of CATWOE from a soft perspective. Syst Pract Action Res 17:55–73