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Comparative Phase Equilibria in the Bi<sub>2</sub>O<sub>3</sub>-MO<sub>x</sub>-Nb<sub>2</sub>O<sub>5</sub> Systems (MO<sub>x</sub>=Mn<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, Co<sub>3</sub>O<sub>4</sub>, ZnO): Page feedback