1. Green Chemistry: Theory and Practice;Anastas,1998
2. Endangered elements, critical raw materials and conflict minerals
3. In occasion of the International Year of the Periodic Table; 2019. EuChems and ACS published specially adapted Tables of the Endangered Elements in their websites, see: https://www.euchems.eu/euchems-periodic-table/, (modified in 2021) and https://www.acs.org/content/acs/en/greenchemistry/research-innovation/endangered-elements.html.