The Conjugating Representation of a Semisimple Group. R.W. Richardson — 1979 Inventiones mathematicae
Orbits, Invariants, and Representations Associated to Involutions of Reductive Groups. R.W. Richardson — 1982 Inventiones mathematicae
Principal Orbit Types for Reductive Groups Acting on Stein Manifolds. R.W. jr. Richardson — 1974 Mathematische Annalen
The Variation of Isotropy Subalgebras for Analytic Transformation Goups. R.W. jr. Richardson — 1973 Mathematische Annalen
Principal Orbit Types for Algebraic Transformation Spaces in Characteristic Zero. R.W. Jr. Richardson — 1972 Inventiones mathematicae