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Controlling the central hub of a directed star will cause the system to get stuck in a particular subspace. Y-Y Liu et al . Nature 478 , E1 (2011) doi:10.1038/nature10544.
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Controlling the central hub of a directed star will cause the system to get stuck in a particular subspace. Y-Y Liu et al. Nature478, E1 (2011) doi:10.1038/nature10544