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Mandal, TK and Sivakumar, T and Augustine, S and Gopalakrishnan, J (2005) Heterovalent cation-substituted Aurivillius phases, $Bi_{2}SrNaNb_{2}TaO_{12}$ and $Bi_{2}Sr_{2}Nb_{3-x}M_{x}O_{12}$ (M = Zr, Hf, Fe, Zn). In: Materials Science And Engineering B-Solid State Materials For Advanced, 121 (1-2). pp. 112-119.
