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- [2] Contributions about the knowledge of the rare earths ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1928, 170 (1/2): : 129 - 144
- [4] RARE-EARTHS - SHIPMENTS SLIP, WHILE SUPPLIES REMAIN PLENTIFUL E&MJ-ENGINEERING AND MINING JOURNAL, 1981, 182 (03): : 154 - &
- [8] ABOUT RARE-EARTHS CONTAINING DIOXYAPATITE ANNALES DE CHIMIE-SCIENCE DES MATERIAUX, 1985, 10 (07): : 645 - 651
- [10] RARE-EARTHS - MONAZITE SUPPLIES TIGHTEN FOLLOWING RECORD YEAR IN 1978 E&MJ-ENGINEERING AND MINING JOURNAL, 1979, 180 (03): : 176 - 178