1. 1) United Nations; Global population Prospects 2019.
2. 2) OECD Environmental Outlook to 2050.
3. 4) Oil World Annual 2016, Ista Mielke GMBH (2016).
4. 5) 7th World Surfactants Congress, Paris (2008). / 8th World Surfactants Congress, Munich (2011). / 9th World Surfactant Congress, Barcelona (2013). / 10th World Surfactants Congress, Istanbul (2015). / 11th World Surfactants Congress, Munich (2019).
5. 6) M. J. Rosen, J. T. Kunjappu, Surfactants and Interfacial Phenomena, 4th Ed., John Wiley & Sons, Hoboken, pp. 39-40 (2012).