Hilgert, Joachim, and K. H. Neeb, editors. Lie-Gruppen und Lie-Algebren. Vieweg Verlag, 1991.

Hilgert, Joachim. “Onishchik, A.L., Und E.B. Vinberg. Lie Groups and Algebraic Groups (Springer, New York, 1990).” Zentralblatt, vol. 722, 1991.

Rösler, Margit. “On Optimal Linear Mean Estimators for Weakly Stationary Stochastic Processes.” Orthogonal Polynomials and Their Applications (Erice, 1990), IMACS Ann. Comput. Appl. Math., 9, 1991, pp. 373–378.

Hilgert, Joachim. “Applications of Lie Semigroups in Analysis.” The Analytical and Topological Theory of Semigroups, edited by K.H. Hofmann and et al., De Gruyter, 1990.

Hilgert, Joachim, and K. H. Hofmann. “On the Causal Structure of Homogeneous Manifolds.” Math. Scand., vol. 67, 1990, pp. 119–44.

Dellnitz, Michael, and Bodo Werner. “Computational Methods for Bifurcation Problems with Symmetries—with Special Attention to Steady State and Hopf Bifurcation Points.”10.1016/0377-0427(89)90150-7__Journal of Computational and Applied Mathematics, 1989, pp. 97–123, doi:10.1016/0377-0427(89)90150-7.

Hilgert, Joachim, and K. H. Hofmann. “Compactly Embedded Cartan Algebras and Invariant Cones in Lie Algebras.” Advances Math., vol. 75, 1989, pp. 168–201.

Hilgert, Joachim. “A Note on Howe’s Oscillator Semigroup.” Ann. Inst. Fourier, vol. 39, 1989, pp. 663–88.

Hilgert, Joachim, et al., editors. Lie Groups, Convex Cones, and Semigroups. Oxford University Press, 1989.

Hilgert, Joachim. “Spectrally Ordered Lie Algebras.” Group Theoretical Methods in Physics, edited by H.D. Doebner and et al., vol. 313, Springer, 1988.

Hilgert, Joachim. “Invariant Lorentzian Orders on Simply Connected Lie Groups.” Arkiv För Mat., vol. 26, 1988, pp. 107–15.

Hilgert, Joachim, and K. H. Hofmann. “Classification of Invariant Cones in Real Lie Algebras.” Bull. AMS, vol. 11, 1988, pp. 441–46.

Hilgert, Joachim, and K. H. Hofmann. “Invariant Cones in Lie Algebras.” Semigroup Forum 37l. Semigroup Forum, 1988, pp. 241–52.

Hilgert, Joachim. “Maximal Semigroups and the Support of Gauss-Semigroups.” Probability and Baysian Statistics, edited by R. Viertl, Plenum Press, 1987.

Hilgert, Joachim. “Maximal Semigroups and Controllability in Products of Lie Groups.” Archiv Math., vol. 49, 1987, pp. 189–95.

Hilgert, Joachim, and K. H. Hofmann. “Invariant Cones in Real Lie Algebras.” Aspects of Positivity in Functional Analysis, edited by R. Nagel and et al., North Holland, 1986.

Hilgert, Joachim. “The Mayer-Vietoris and the Puppe Sequence in K-Theory for C*-Algebras.” Studia Math., vol. 83, 1986, pp. 97–104.

Hilgert, Joachim, and K. H. Hofmann. “On the Automorphism Group of Cones and Wedges.” Geom. Dedicata, vol. 21, 1986, pp. 205–17.

Hilgert, Joachim, and K. H. Hofmann. “On Sophus Lie’s Fundamental Theorem.” J. Funct. Anal., vol. 67, 1986, pp. 1–27.

Hilgert, Joachim, et al. “Controllabilty of Systems on Nilpotent Lie Groups.” Beiträge Alg. Geom., vol. 20, 1985, pp. 185–90.