@article{10_21136_CMJ_1991_102503,
     author = {Vondra, Alexandr},
     title = {Natural dynamical connections},
     journal = {Czechoslovak Mathematical Journal},
     pages = {724--730},
     year = {1991},
     volume = {41},
     number = {4},
     doi = {10.21136/CMJ.1991.102503},
     mrnumber = {1134961},
     zbl = {0764.53019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102503/}
}