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Supported in part by NSF Grant MCS-7001730
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Eberlein, P. A canonical form for compact nonpositively curved manifolds whose fundamental groups have nontrivial center. Math. Ann. 260, 23–29 (1982). https://doi.org/10.1007/BF01475751
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DOI: https://doi.org/10.1007/BF01475751