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Hirschfelder, Klaus; Völkl, Werner; Kühnel, Hans-Ulrich; Sinn, Walther; Huck, Armin (March 2002). "The first continuously variable intake system in the new eight-cylinder engine from BMW". MTZ Worldwide. 63 (3): 2–6. doi:10.1007/bf03227525. ISSN2192-9114.
xolmatic.com
"E65 BUS SYSTEMS" www.xolmatic.com/xprojects/XE65/MOST/bus%20system.pdf. Retrieved 19 February 2018.