1. Real hypersurfaces in complex manifolds;Burns, D., Jr.,1977
2. E. Cartan, Sur la géométrie pseudo-conforme des hypersurfaces de deux variables complexes. I, II, Oeuvres II, 2, pp. 1231-1304; ibid. III, 2, pp. 1217-1238.
3. Real hypersurfaces in complex manifolds;Chern, S. S.;Acta Math.,1974
4. Chains in CR geometry;Jacobowitz, Howard;J. Differential Geom.,1985
5. On non-degenerate real hypersurfaces, graded Lie algebras and Cartan connections;Tanaka, Noboru;Japan. J. Math. (N.S.),1976