- D. N. Akhiezer, E. B. Vinberg, “Weakly symmetric spaces and spherical varieties”, Transformation Groups, 4, № 1, 1999,
3 
- D. I. Panyushev, E. B. Vinberg, “An infinitesimal characterization of the complexity of homogeneous spaces”, Transformation Groups, 4, № 1, 1999,
97