%0 Journal Article %A Akhmet'ev, Pjotr %A Szűcs, András %T Geometric proof of the easy part of the Hopf invariant one theorem %J Mathematica slovaca %D 1999 %P 71-74 %V 49 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1999__49_1_a8/ %G en %F MASLO_1999__49_1_a8