2Lokshin EH P,Vershkova JU A,Kalinnikov V T.Method of recovering rare-earth minerals from phosphogypsum. RU2225892 . 2004
3Lededev V N,Lokshin EHP.Method of isolation of rare-earth elements from phosphogypsum. RU2158317 . 2000
4Hurst F J,Crouse D J,Brown K B.Solvent Extraction of Ura-nium From Wet-Process Phosphoric Acid. Oak Ridge Na-tional Laboratory.Report ORNLTM-2522 . 1969
5Hurst F J,,Crouse D J,Brown K B.Recovery of uranium fromwet-process phosphoric acid. Ind.Eng.Chem.ProcessDes.Develop . 1972
6Hurst F J,Crouse D J.Reductive stripping process for the re-covery of uranium from wet-process phosphoric acid. U.S.3711591 . 1973
