1. Klug, R.L. (1972) ‘Scheduled oil sampling as a maintenance tool’, S.A. E. Paper 720372, April, also: Caterpillar Tractor Co., Peoria, Illinois 61611, USA Report FEG 00023-01 (1973).
2. Bond, B.B. (1965), ‘Spectrometric oil analysis’, Report 0 & R — P — 1, Naval Air Station, Pensacola, Florida 32508, October.
3. Davies, A.E. (1972), ‘Principles and practice of aircraft powerplant maintenance’, Trans. I. Mar. E.
84, 441 - 447.
4. Waggoner, C.A. (1971), ‘Spectrometric oil analysis — principles and practice’, Materials Report 71A, Defence Research Establishment Pacific, Victoria B.C., Canada. March.
5. Barugh, J.K. (1972), ‘Equipment reliability through oil monitoring’, Vactric Control Equipment Ltd., Morden, Surrey SM4 4LL.