@article{10_21136_CMJ_1969_100918,
     author = {Van\v{z}ura, Ji\v{r}{\'\i}},
     title = {Remark on involutive subspaces and regular bases},
     journal = {Czechoslovak Mathematical Journal},
     pages = {515--517},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1969},
     doi = {10.21136/CMJ.1969.100918},
     mrnumber = {0261640},
     zbl = {0322.15005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1969.100918/}
}