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@article{MZ_1981__178_173094, author = {Stefano Marchiafava}, title = {Characterization of {Riemannian} {Manifolds} with {Weak} {Homology} {Group} {G2} {(Following} {A.} {Gray).}}, journal = {Mathematische Zeitschrift}, pages = {157--162}, publisher = {mathdoc}, volume = {178}, year = {1981}, zbl = {0449.53026}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173094/} }
Stefano Marchiafava. Characterization of Riemannian Manifolds with Weak Homology Group G2 (Following A. Gray).. Mathematische Zeitschrift, Tome 178 (1981), pp. 157-162. http://geodesic.mathdoc.fr/item/MZ_1981__178_173094/