@article{10_1090_S0894_0347_1992_1126118_X,
     author = {Cheeger, Jeff and Fukaya, Kenji and Gromov, Mikhael},
     title = {Nilpotent structures and invariant metrics on collapsed manifolds},
     journal = {Journal of the American Mathematical Society},
     pages = {327--372},
     publisher = {mathdoc},
     volume = {05},
     number = {2},
     year = {1992},
     doi = {10.1090/S0894-0347-1992-1126118-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1992-1126118-X/}
}