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Hilgert J, Hofmann KH. Compactly Embedded Cartan Algebras and Invariant Cones in Lie Algebras. Advances Math. 1989;75:168-201.
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Hilgert J. A Note on Howe’s Oscillator Semigroup. Ann Inst Fourier. 1989;39:663-688.
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Hilgert J, Hofmann KH, Lawson JD, eds. Lie Groups, Convex Cones, and Semigroups. Oxford University Press; 1989.
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