@article{10_21136_CMJ_1971_101007,
     author = {Kol\'a\v{r}, Ivan},
     title = {Complex velocities on real manifolds},
     journal = {Czechoslovak Mathematical Journal},
     pages = {118--123},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1971},
     doi = {10.21136/CMJ.1971.101007},
     mrnumber = {0276884},
     zbl = {0216.20501},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101007/}
}