Extrinsic symmetric spaces and orbits of s-representations. E. Heintze; J.-H. Eschenburg — 1995 Manuscripta mathematica
Erratum to "Extrinsic symmetric spaces and orbits of s-representations". E. Heintze; J.-H. Eschenburg — 1997 Manuscripta mathematica
Hyperpolar actions and k-flat homogeneous spaces. E. Heintze; R. Palais; C.-L. Terng — 1994 Journal für die reine und angewandte Mathematik