TY - JOUR AU - Cheeger, Jeff AU - Fukaya, Kenji AU - Gromov, Mikhael TI - Nilpotent structures and invariant metrics on collapsed manifolds JO - Journal of the American Mathematical Society PY - 1992 SP - 327 EP - 372 VL - 05 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1992-1126118-X/ DO - 10.1090/S0894-0347-1992-1126118-X ID - 10_1090_S0894_0347_1992_1126118_X ER -