Schroeter-Wittke, Harald. “God’s Love ‘Made Visible’. Eine Weihnachtsmusik von Dave Brubeck.” Der Evangelische Erzieher 41 (1989): 506–8.
LibreCat: /record/43470

Hilgert, Joachim, and K.H. Hofmann. “Compactly Embedded Cartan Algebras and Invariant Cones in Lie Algebras.” Advances Math. 75 (1989): 168–201.
LibreCat: /record/51448

Hilgert, Joachim. “A Note on Howe’s Oscillator Semigroup.” Ann. Inst. Fourier 39 (1989): 663–88.
LibreCat: /record/51447

Hilgert, Joachim, K.H. Hofmann, and J.D. Lawson, eds. Lie Groups, Convex Cones, and Semigroups. Oxford: Oxford University Press, 1989.
LibreCat: /record/51498