@article{10_21136_CMJ_1967_100761,
     author = {\v{S}vec, Alois},
     title = {On the second covariant derivative of a vector field},
     journal = {Czechoslovak Mathematical Journal},
     pages = {77--78},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1967},
     doi = {10.21136/CMJ.1967.100761},
     mrnumber = {0205191},
     zbl = {0162.53602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1967.100761/}
}