@articleHilgert_1987, title=Maximal Semigroups and Controllability in Products of Lie Groups, volume=49, journal=Archiv Math., author=Hilgert, Joachim, year=1987, pages=189–195 

@inbookHilgert_Hofmann_1986, title=Invariant Cones in Real Lie Algebras, booktitle=Aspects of Positivity in Functional Analysis, publisher=North Holland, author=Hilgert, Joachim and Hofmann, K.H., editor=Nagel, R. and et al., year=1986 

@articleHilgert_1986, title=The Mayer-Vietoris and the Puppe Sequence in K-Theory for C*-algebras, volume=83, journal=Studia Math., author=Hilgert, Joachim, year=1986, pages=97–104 

@articleHilgert_Hofmann_1986, title=On the Automorphism Group of Cones and Wedges, volume=21, journal=Geom. Dedicata, author=Hilgert, Joachim and Hofmann, K.H., year=1986, pages=205–217 

@articleHilgert_Hofmann_1986, title=On Sophus Lie’s Fundamental Theorem, volume=67, journal=J. Funct. Anal., author=Hilgert, Joachim and Hofmann, K.H., year=1986, pages=1–27 

@articleHilgert_Hofmann_Lawson_1985, title=Controllabilty of Systems on Nilpotent Lie Groups, volume=20, journal=Beiträge Alg. Geom., author=Hilgert, Joachim and Hofmann, K.H. and Lawson, J.D., year=1985, pages=185–190 

@articleHilgert_Hofmann_1985, title=Semigroups in Lie Groups, Semialgebras in Lie Algebras, volume=288, journal=Trans. AMS, author=Hilgert, Joachim and Hofmann, K.H., year=1985, pages=481–504 

@articleHilgert_Hofmann_1985, title=Lorentzian Cones in Real Lie Algebras, volume=100, journal=Monatshefte Math., author=Hilgert, Joachim and Hofmann, K.H., year=1985, pages=183–210 

@articleHilgert_Hofmann_1985, title=Lie Semialgebras are Real Phenomena, volume=270, journal=Math. Ann., author=Hilgert, Joachim and Hofmann, K.H., year=1985, pages=97–103 

@articleHilgert_Hofmann_1985, title=Old and New on SL(2), volume=54, journal=Manuscripta Math., author=Hilgert, Joachim and Hofmann, K.H., year=1985, pages=17–52 

@articleHilgert_Hofmann_1984, title=Lie Theory of Semigroups, volume=30, journal=Semigroup Forum, author=Hilgert, Joachim and Hofmann, K.H., year=1984, pages=243–251