1. Wood, A.J., and Wollenberg, B.F.: ‘Power generation, operation and control’, 2nd edn.(Wiley, Chichester, New York 1996)
2. CAISO: ‘The California ISO’, in ‘Spinning reserve requirements’, [online] http://www.caiso.com/
3. IESO: ‘The independent electricity system operator of Ontario electrical system’, 2004, [online] http://www.ieso.ca/
4. NYISO: ‘The New York independent system operator’, 2007, [online] http:///www.nyiso.com
5. REE: ‘Red Eléctrica de España’, in Operación del Sistema Eléctrico, 2007, [online] http://www.ree.es/cap03/pdf/po/PO_resol_30jul1998_b.pdf