Insights into Stoichiometric and Lean Combustion Phenomena of Gasoline–Butanol, Gasoline–Ethanol, iso-Octane–Butanol and iso-Octane–Ethanol Blends in an Optical SI Engine - Aleiferis, PG; Behringer, MK; OudeNijeweme, D; Freeland, P (Combustion Science and Technology, 2016)