1. Cowling, M., De Mari, F., Korányi, A., Reimann, H.M.: Contact and conformal maps on Iwasawa N groups, Harmonic analysis on complex homogeneous domains and Lie groups (Rome, 2001), Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. Rend. Lincei (9) Mat. Appl., 13, (2002), 3–4, pp. 219–232. Harmonic analysis on complex homogeneous domains and Lie groups (Rome, 2001). MR 1984102 (2004f:53028)
2. Cowling, M., De Mari, F., Korányi, A., Reimann, H.M.: Contact and conformal maps in parabolic geometry. I, Geom. Dedicata 111, 2005, pp. 65–86. MR 2155176 (2006d:53049)
3. Ezhov, V., Schmalz, G.: Non-linearizable CR-automorphisms, torsion-free elliptic CR-manifolds and second order ODE. J. Reine Angew. Math. 584, (2005), pp. 215–236. MR 2155091 (2006k:32071)
4. Han, C.-K.: Solvability of overdetermined PDE systems that admit a complete prolongation and some local problems in CR geometry. J. Korean Math. Soc. 40, (2003), no. 4, pp. 695–708. Sixth International Conference on Several Complex Variables (Gyeongju, 2002). MR 1995072 (2004f:32049)
5. Korányi, A.: Multicontact maps: results and conjectures, Lecture notes of Seminario Interdisciplinare di Matematica. Vol. IV, Lect. Notes Semin. Interdiscip. Mat., IV, S.I.M. Dept. Math. Univ. Basilicata, Potenza, 2005, pp. 57–63. MR 2222536 (2006m:53123)