Gray, C. B. Electrical machines and drive systems / C.B. Gray. - Essex, England : New York : Longman Scientific & Technical ; Wiley, 1989. - xviii, 446 p. : ill. ; Includes index. ISBN: 0582305403 0470213191 9780582305403 9780470213193 Subjects--Topical Terms: Electric machinery.Electric driving. LC Class. No.: QC573.G7