Kouraim, Mohamed Nouh, Mohamed Mohamed Fawzy, and Osama Saad Helaly. 2014. “Leaching of Lanthanides from Phosphogypsum Waste Using Nonyl Phenol Ethoxylate Associated With HNO3 and HCl”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 16 (2):31-44. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2065.