Analogues of Rossi's map and E. Cartan's classification of homogeneous   strongly pseudoconvex 3-dimensional hypersurfaces
  We introduce analogues of a map due to Rossi and show how they can be used to explicitly determine all covers of certain homogeneous strongly pseudoconvex 3-dimensional hypersurfaces that appear in the classification obtained by E. Cartan in 1932. 
A. V. Isaev