@article{CMJ_1997__47_1_a4,
     author = {Sierra, Jos\'e M. and Vald\'es, Antonio},
     title = {A canonical connection associated with certain $G$-structures},
     journal = {Czechoslovak Mathematical Journal},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {1997},
     mrnumber = {1435606},
     zbl = {0902.53020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_1_a4/}
}