A Raman Spectroscopy Study of Disorder and Local Vibrational Modes in ({ m{L}}{{ m{a}}_{{ m{0: 7}}}}{ m{S}}{{ m{r}}_{{ m{0: 3}}}}{ m{M}}{{ m{n}}_{{ m{1 - x}}}}{{ m{M}}_{ m{x}}}{{ m{O}}_{ m{3}}}) (M=Fe, Co)
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