J. Hilgert, “Maximal Semigroups and Controllability in Products of Lie Groups,” Archiv Math., vol. 49, pp. 189–195, 1987.
LibreCat: /record/51452

J. Hilgert and K. H. Hofmann, “Invariant Cones in Real Lie Algebras,” in Aspects of Positivity in Functional Analysis, R. Nagel and et al., Eds. North Holland, 1986.
LibreCat: /record/51487

J. Hilgert, “The Mayer-Vietoris and the Puppe Sequence in K-Theory for C*-algebras,” Studia Math., vol. 83, pp. 97–104, 1986.
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J. Hilgert and K. H. Hofmann, “On the Automorphism Group of Cones and Wedges,” Geom. Dedicata, vol. 21, pp. 205–217, 1986.
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J. Hilgert and K. H. Hofmann, “On Sophus Lie’s Fundamental Theorem,” J. Funct. Anal., vol. 67, pp. 1–27, 1986.
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J. Hilgert, K. H. Hofmann, and J. D. Lawson, “Controllabilty of Systems on Nilpotent Lie Groups,” Beiträge Alg. Geom., vol. 20, pp. 185–190, 1985.
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J. Hilgert and K. H. Hofmann, “Semigroups in Lie Groups, Semialgebras in Lie Algebras,” Trans. AMS, vol. 288, pp. 481–504, 1985.
LibreCat: /record/51458

J. Hilgert and K. H. Hofmann, “Lorentzian Cones in Real Lie Algebras,” Monatshefte Math., vol. 100, pp. 183–210, 1985.
LibreCat: /record/51457

J. Hilgert and K. H. Hofmann, “Lie Semialgebras are Real Phenomena,” Math. Ann., vol. 270, pp. 97–103, 1985.
LibreCat: /record/51460

J. Hilgert and K. H. Hofmann, “Old and New on SL(2),” Manuscripta Math., vol. 54, pp. 17–52, 1985.
LibreCat: /record/51459

J. Hilgert and K. H. Hofmann, “Lie Theory of Semigroups,” Semigroup Forum, vol. 30, pp. 243–251, 1984.
LibreCat: /record/51461