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- [8] RARE EARTH ABUNDANCES IN SOME BASIC ROCKS JOURNAL OF GEOPHYSICAL RESEARCH, 1968, 73 (18): : 6085 - +
- [9] AVERAGE AND BASIC MOLYBDATES OF RARE EARTH ELEMENTS ZHURNAL NEORGANICHESKOI KHIMII, 1971, 16 (03): : 660 - &
- [10] RARE EARTH RESEARCH 2 JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS, 1965, 280 (04): : 361 - &