Duals of Orbit Spaces in Groups With Relatively Compact Inner Automorphism Groups Are Hypergroups. R.W. Henrichs; K. Hartmann; R. Lasser — 1979 Monatshefte für Mathematik
Topological Frobenius Reciprocity for Projective Limits of Lie Groups. R. Felix; R.W. Henrichs; H. Skudlarek — 1979 Mathematische Zeitschrift