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2. J. Nilsson: Why did Henry Ford double his minimum wage?, The Saturday Evening Post (2014)
3. C. Song, C.S. Hsu, I. Mochida (Eds.): Chemistry of Diesel Fuels (Taylor Francis, Philadelphia 2000)
4. J. Clew: The Scott Motorcycle: The Yowling Two-Stroke (Haynes, Newbury Park 2004)
5. A. Nahum: The Rotary Aero Engine (NMSI Trading, London 1999)