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@article{MAN_1978__232_163081, author = {A. Rigas}, title = {Some {Bundles} of {Non-Negative} {Curvature.}}, journal = {Mathematische Annalen}, pages = {187--194}, publisher = {mathdoc}, volume = {232}, year = {1978}, zbl = {0354.53039}, url = {http://geodesic.mathdoc.fr/item/MAN_1978__232_163081/} }
A. Rigas. Some Bundles of Non-Negative Curvature.. Mathematische Annalen, Tome 232 (1978), pp. 187-194. http://geodesic.mathdoc.fr/item/MAN_1978__232_163081/