%0 Journal Article %A Kolář, Ivan %T Natural transformations of the second tangent functor into itself %J Archivum mathematicum %D 1984 %P 169-172 %V 20 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1984__20_4_a1/ %G en %F ARM_1984__20_4_a1