I am trying to understand E. Cartan’s classification of 3–dimensional homogeneous strongly pseudoconvex CR-manifolds given in the papers
Sur la géométrie pseudo-conforme des hypersurfaces de l'espace de deux variables complexes (I) & (II).
These papers are in french in which I have $0$ knowledge.
Can anyone suggest some reference where I can find the proofs written in English?
Thank you.