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Hilgert, J., &; Hofmann, K. H. (1986). Invariant Cones in Real Lie Algebras. In R. Nagel &; et al. (Eds.), Aspects of Positivity in Functional Analysis. North Holland.
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Hilgert, J. (1986). The Mayer-Vietoris and the Puppe Sequence in K-Theory for C*-algebras. Studia Math., 83, 97–104.
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Hilgert, J., &; Hofmann, K. H. (1986). On the Automorphism Group of Cones and Wedges. Geom. Dedicata, 21, 205–217.
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Hilgert, J., &; Hofmann, K. H. (1986). On Sophus Lie’s Fundamental Theorem. J. Funct. Anal., 67, 1–27.
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