@articleSchroeter-Wittke_1989, title=God’s Love “Made Visible”. Eine Weihnachtsmusik von Dave Brubeck, volume=41, journal=Der Evangelische Erzieher, author=Schroeter-Wittke, Harald, year=1989, pages=506–508 
LibreCat: /record/43470

@articleHilgert_Hofmann_1989, title=Compactly Embedded Cartan Algebras and Invariant Cones in Lie Algebras, volume=75, journal=Advances Math., author=Hilgert, Joachim and Hofmann, K.H., year=1989, pages=168–201 
LibreCat: /record/51448

@articleHilgert_1989, title=A Note on Howe’s Oscillator Semigroup, volume=39, journal=Ann. Inst. Fourier, author=Hilgert, Joachim, year=1989, pages=663–688 
LibreCat: /record/51447

@bookHilgert_Hofmann_Lawson_1989, place=Oxford, title=Lie Groups, Convex Cones, and Semigroups, publisher=Oxford University Press, year=1989 
LibreCat: /record/51498