TY - JOUR AU - D. V. Alekseevskii TI - $S^n$ and $E^n$ are the only Riemannian spaces that admit an essential conformal transformation JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1973 VL - 28 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1973_28_5_a8/ LA - ru ID - RM_1973_28_5_a8 ER -