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[2] OneStone Consulting: Covid-19 Impact Analysis on the Global Cement Production. Multi-client market report, May 2020, OneStone Consulting Ltd, Varna/ Bulgaria

[3] Cembureau: Cementing the European Green Deal – Reaching climate neutrality along the cement and concrete value chain by 2050, May 2020, Cembureau – The European Cement Association, Brussels/Belgium

[4] Stripple, H., et al.: CO₂ uptake in cement-containing products – Background of calculation models for IPCC implementation. IVL Swedish Environmental Research Institute, 2018, Stockholm/Sweden

[5] Harder, J.: Carbon capture, utilization and storage in the cement industry. ZKG International, 11/2018, pp. 36-43

[6] Harder, J.: Demand and Availability of Raw Materials for the Cement and Concrete Production, Presentation at ECRA Online Seminar OS20-03, 30th September 2020