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- [3] COPRECIPITATION OF EUROPIUM WITH CALCIUM-SULFATE DIHYDRATE JOURNAL OF APPLIED CHEMISTRY OF THE USSR, 1989, 62 (02): : 216 - 219
- [4] TRANSFORMATION OF CALCIUM-SULFATE SEMIHYDRATE INTO DIHYDRATE UKRAINSKII KHIMICHESKII ZHURNAL, 1986, 52 (11): : 1131 - 1133