@article{GDZPPN002220423,
title = {Einstein Spaces Isometrically Diffeomorphic to a Sphere.},
journal = {Manuscripta mathematica},
volume = {22},
year = {1977},
pages = {1-6},
zbl = {0358.53030},
url = {http://dml.mathdoc.fr/item/GDZPPN002220423}
}
Simon, Udo. Einstein Spaces Isometrically Diffeomorphic to a Sphere.. Manuscripta mathematica, Tome 22 (1977) pp. 1-6. http://gdmltest.u-ga.fr/item/GDZPPN002220423/