@article{JRAM_1978__302_152034,
     author = {Kam-Ping Mok},
     title = {On the differential geometry of frame bundles of {Riemannian} manifolds.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {16--31},
     publisher = {mathdoc},
     volume = {302},
     year = {1978},
     zbl = {0378.53016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__302_152034/}
}