@article{MOMA_1988__105_2_178378,
     author = {Masami Sekizawa},
     title = {Natural {Transformations} of {Symmetric} {Affine} {Connections} on {Manifolds} to {Metrics} on {Linear} {Frame} {Bundles:} a {Classification.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {229--244},
     publisher = {mathdoc},
     volume = {105},
     number = {2},
     year = {1988},
     zbl = {0639.53022},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1988__105_2_178378/}
}