1. Bollen, M.H.J.: ‘Understanding power quality problems: voltage sags and interruptions’, (IEEE Press Series on Power Engineering 2000)
2. IEEE Standard 1195-1995: ‘IEEE recommended practice for monitoring electric power quality’, 1995
3. IEEE Standard 493-2007: ‘Gold Book, IEEE recommended practice for the design of reliable industrial and commercial power systems’, 2007
4. Draft 4, for IEEE Standard 1564, 2003: ‘The IEEE voltage sags indices’. Working document, 2003