*Charles Fayette Taylor, "Internal Combustion Engine In Theory And Practice, Second Edition, Revised, Volume 2", MIT Press, 1985, Chapter 2 on "Detonation and Preignition", pp 34–85, ISBN 9780262700276.
*"Experimental Investigation on the Use of Ion Current on SI Engines for Knock Detection", SAE Technical Paper n. 2009-01-2745, DOI 10.4271/2009-01-2745, ISSN 0148-7191, Nov., 2009.