Sarker, A.; Rahman, A. L.; Debnath, T.; Hussain, A. Synthesis and Characterization of a Solid Solution Series of the Type Bi<sub>2< sub>M<sub>x< sub>Mn<sub>4-x< sub>O<sub>10< sub> (M = Cr<sup>3+< sup>, Co<sup>3+< sup> And 0.0 ≤ X ≤ 2.0.). J Bangladesh Acad Sci 2021, 45, 13-26.