@article{ARM_1968_4_2_a4,
     author = {Kowalski, Old\v{r}ich},
     title = {A contribution to the {Cartan's} method of specialization of frames},
     journal = {Archivum mathematicum},
     pages = {107--120},
     year = {1968},
     volume = {4},
     number = {2},
     mrnumber = {0303447},
     zbl = {0207.20505},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1968_4_2_a4/}
}