Hilgert, Joachim, et al. “The Geometry of Nilpotent Coadjoint Orbits of Convex Type in Hermitian Lie Algebras.” J. Lie Theory, vol. 4, 1994, pp. 47–97.

Hilgert, Joachim, et al. “Spherical Functions on Ordered Symmetric Spaces.” Ann. Inst. Fourier, vol. 44, 1994, pp. 927–65.

Hilgert, Joachim, et al. “Symplectic Convexity Theorems and Coadjoint Orbits.” Compositio Math., vol. 94, 1994, pp. 129–80.

Hilgert, Joachim. “A Convexity Theorems for Boundaries of Ordered Symmetric Spaces.” Canad. J. Math., vol. 46, 1994, pp. 746–57.

Hilgert, Joachim. “Leptin, H. Und J. Ludwig. Unitary Representation Theory of Exponential Lie Groups (De Gruyter, Berlin, 1994).” Zentralblatt Für Math., 1994.

Lasser, R., and Margit Rösler. “A Note on Property (T) of Orthogonal Polynomials.”10.1007/bf01202312__Archiv Der Mathematik, vol. 60, no. 5, Springer Science and Business Media LLC, 1993, pp. 459–63, doi:10.1007/bf01202312.

Hilgert, Joachim, and K. H. Neeb, editors. Lie Semigroups and Their Applications. Springer, 1993.

Hilgert, Joachim. “Corwin, L. Und F.P. Greenleaf. Representations of Nilpotent Lie Groups and Their Applications. (Cambridge University Press, 1990).” JBer. DMV, vol. 95, 1993.

Hilgert, Joachim. “Fomenko, A.T. Symplectic Geometry (Gordon and Breach, 1988).” JBer. DMV, vol. 94, 1992.

Hilgert, Joachim, and G. Ólafsson. “Analytic Extensions of Representations, the Solvable Case.” Japan. J. Math., vol. 18, 1992, pp. 213–90.

Hilgert, Joachim. “Controllability on Real Reductive Groups.” Math. Zeitschrift, vol. 209, 1992, pp. 463–66.

Lasser, R., and Margit Rösler. “Linear Mean Estimation of Weakly Stationary Stochastic Processes under the Aspects of Optimality and Asymptotic Optimality.”10.1016/0304-4149(91)90095-t__Stochastic Processes and Their Applications, vol. 38, no. 2, Elsevier BV, 1991, pp. 279–93, doi:10.1016/0304-4149(91)90095-t.

Hilgert, Joachim. “Varadarajan, V.S. An Introduction to Harmonic Analysis on Semisimple Lie Groups (Cambridge University Press, 1989).” JBer. DMV, vol. 94, no. 4, 1991.

Hilgert, Joachim. “Terras, A. Harmonic Analysis on Symmetric Spaces I and II (Springer, New York, 1985 Und 1988).” JBer. DMV, vol. 93, no. 2, 1991.

Hilgert, Joachim, et al. “Hardy Spaces on Affine Symmetric Spaces.” J. Reine Und Angew. Math., vol. 415, 1991, pp. 189–218.

Hilgert, Joachim. “Group Theoretical Aspects of Gödels Model.” Jahrbuch Der Gödel Gesellschaft, edited by Joachim Hilgert, 1991.

Hilgert, Joachim. “Infinitesimally Generated Subsemigroups of Motion Groups.” Rocky Mount. J. Math., vol. 21, 1991, pp. 865–78.

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.