TY - JOUR AU - Katok, A. AU - Spatzier, R. TI - Nonstationary normal forms and rigidity of group actions JO - Electronic research announcements of the American Mathematical Society PY - 1996 SP - 124 EP - 133 VL - 02 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-96-00016-9/ DO - 10.1090/S1079-6762-96-00016-9 ID - ERAAMS_1996_02_3_a2 ER -