@article{MM2_1990__66_1_155476,
     author = {Martin Strake and Gerard Walschap},
     title = {Connection metrics of nonnegative curvature on vector bundles.},
     journal = {Manuscripta mathematica},
     pages = {309--318},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     zbl = {0695.53032},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__66_1_155476/}
}