%0 Journal Article %A Takens, Floris %T Derivations of vector fields %J Compositio Mathematica %D 1973 %P 151-158 %V 26 %N 2 %I Noordhoff International Publishing %U http://www.numdam.org/item/CM_1973__26_2_151_0/ %G en %F CM_1973__26_2_151_0