For some historical background on the coming wave of electric assisted turbochargers,
turbo compound and hybrid turbo generators for cars I recommend Turbocharging 
and Turbochargers. Published by the  I Mech E 1982 ISBN 0 85298 491 X
Much more in depth than the Hugh MacInnes book. Also some of the original
work on the variable vane turbochargers now widely used on European diesel
engine powered cars. Many technical papers on work done world wide.

Paul Lamar
 
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