Manual of Westinghouse Outdoor Bushings
Technical Data 33-360.
 Apparatus Bushing Reference Book, Gen-
eral Electric Co., Bulletin GET- 2525.
 NEMA Publication No. 107-1964, Reaffirmed
by NEMA 1976 - Methods of Measurement of
Radio Influence Voltage (RIV) of High-Voltage
Apparatus, National Electrical Manufacturers
(FIST 3-2 11/91)
Association, 2101 L Street NW, Washington, D.C.
 IEEE Standard 21-1976 - IEEE General Re-
quirements and Test Procedure for Outdoor
Apparatus Bushings, Published by the Institute of
Electrical and Electronic Engineers, Inc.
 Hubert, Charles L., Preventive Maintenance
of Electrical Equipment, McGraw-Hill Book Co.,
New York, N.Y., 1969.