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This research was done under the support of SFB 40, Bonn.
The author wishes to thank the members of SFB 40 and in particular J. P. Bourguignon, H. Karcher and E. Ruh for helpful discussions during the preparation of this note. He also is indebted to the referee whose suggestions made this note more readable.
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Rigas, A. Some bundles of non-negative curvature. Math. Ann. 232, 187–193 (1978). https://doi.org/10.1007/BF01421406
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DOI: https://doi.org/10.1007/BF01421406