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Similarly, magnetically driven ferroelectricity is also detected in the Li homologues, LiFeSi$_2$O$_6$ ($T_C \\simeq 18$ K) and LiCrSi$_2$O$_6$ ($T_C \\simeq 11$ K). In all these monoclinic systems the electric polarization can be strongly modified by magnetic fields. 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