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@article{MM2_1989__64_2_155406, author = {M. Strake and G. Walschap}, title = {...-flat manifolds and {Riemannian} submersions.}, journal = {Manuscripta mathematica}, pages = {213--226}, publisher = {mathdoc}, volume = {64}, number = {2}, year = {1989}, zbl = {0687.53039}, url = {http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155406/} }
M. Strake; G. Walschap. ...-flat manifolds and Riemannian submersions.. Manuscripta mathematica, Tome 64 (1989) no. 2, pp. 213-226. http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155406/