@article{GDZPPN002425513,
title = {Characterization of Riemannian Manifolds with Weak Homology Group G2 (Following A. Gray).},
journal = {Mathematische Zeitschrift},
volume = {177},
year = {1981},
pages = {157-162},
zbl = {0449.53026},
url = {http://dml.mathdoc.fr/item/GDZPPN002425513}
}
Marchiafava, Stefano. Characterization of Riemannian Manifolds with Weak Homology Group G2 (Following A. Gray).. Mathematische Zeitschrift, Tome 177 (1981) pp. 157-162. http://gdmltest.u-ga.fr/item/GDZPPN002425513/