1. M. Wackernagel, S. Browne, Earth overshoot day,https://www.overshootday.org/, 2018. (accessed 08.06.2018, last modified: 07.07.2018).
2. D. Bosseboeuf, Energy efficiency trends and policies in industry – an analysis based on the ODYSSEE and MURE databases.http://www.odyssee-mure.eu/publications/br/energy-efficiency-in-industry.html, 2015 (accessed 08.06.2018, last modified: 06.06.2018).
3. Sustaining high energy efficiency in existing processes with advanced process integration technology;Zhang;Appl. Energy,2013
4. Low carbon energy and feedstock for the European chemical industry;Bazzanella,2017
5. R. Reimert, F. Marschner, H.-J. Renner, W. Boll, E. Supp, M. Brejc, W. Liebner, Gas production, 2. Processes, in: Ullmann’s Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany, 2000, pp. 423–482.