1. Market analysis for urban mining of phosphogypsum;Layr;BHM Berg- und Hüttenmännische Monatshefte,2019
2. Gypsum sourcing: forthcoming challenges and recommendations. Symposium on availability of raw materials from secondary resources: a key aspect of circular economy;Marlet;Symposium on the Availability of raw materials from secondary sources - a key aspect of circular economy. 24. April 2018, Palais des Nations, Geneva, Switzerland.,2018
3. Auswirkungen des Kohleausstiegs auf die Gipsversorgung Deutschlands;Demmich;REWIMET Symposium 2021 Ressourcenmanagement. 25.-26. August 2021. Clausthal-Zellerfeld, Germany.,2021
4. Rare earth metals from secondary sources: Review of potential supply from waste and byproducts;Gaustad;Resources, Conversation & Recycling,2021
5. EU (2020) European Commission, Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs, Blengini, G., El Latunussa, C., Eynard, U., et al., Study on the EU's list of critical raw materials (2020) : final report, Publications Office, 2020, https://data.europa.eu/doi/10.2873/904613.