@article{RM_1990_45_6_a15,
     author = {A. M. Lukatskii},
     title = {The negativeness of the curvatures of groups of diffeomorphisms for locally {Euclidean} manifolds},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {160--161},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1990_45_6_a15/}
}