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2. The Crystallography of Synthetic YTaO4 and Fused Fergusonite;Ferguson;Can. Mineral.,1957
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4. Mechanical Twins and Rubber-like Behavior of Rare-Earth Orthoniobates, Part I: Structure and Domain Walls of RNbO4 Crystals;Tsunekawa;Sci. Rep. Res. Inst., Tohoku Univ.,1980