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B. Mössner; S. Kemmler-Sack. (1985).
9R-Stapelvarianten vom Typ Ba3(B,B′)2O9−y mit B,B′ ≡ Mo, W, V, Ti. , 114(2), 0–341.
doi:10.1016/0022-5088(85)90453-9
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