%0 Journal Article %A Rebelo, C. %T A note on uniqueness of Cauchy problems associated to planar Hamiltonian systems. %J Portugaliae mathematica %D 2000 %P 415-419 %V 57 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_2000__57_4_49053/ %G en %F PORMA_2000__57_4_49053