1. Gebrüder Bessel (1877) Verfahren zur Reinigung von Graphit. German patent 42, class 22
2. Fuerstenau MC, Jameson G, Yoon RH (eds) (2007) Froth flotation, a century of innovation. Society for Mining Metallurgy and Exploration Inc (SME), Littleton
3. Fuerstenau DW (2007) A century of developments in the chemistry of flotation processing. In: Fuerstenau MC, Jameson G, Yoon RH (eds) Froth flotation, a century of innovation. Society for Mining Metallurgy and Exploration Inc (SME), Littleton, pp 3–64
4. Gaudin AM, Miaw HL, Spedden HR (1957) Native floatability and crystal structure. In: Schulman JH (ed) Proceedings of the second international congress of surface activity, vol III—electrical phenomena at solid/liquid interface. Butterworths Scientific Publications, London, pp 202–219
5. Young T (1805) An essay on the cohesion of fluids. Philos Trans R Soc Lond 95:65–87