%0 Journal Article %A Macias-Virgos, E. %A Pereira-Saez, M.J. %T Left eigenvalues of $2\times 2$ symplectic matrices %J The electronic journal of linear algebra %D 2009 %P 274-280 %V 18 %I mathdoc %U http://geodesic.mathdoc.fr/item/ELA_2009__18__a34/ %G en %F ELA_2009__18__a34