@article{ELA_2009__18__a34,
     author = {Macias-Virgos, E. and Pereira-Saez, M.J.},
     title = {Left eigenvalues of $2\times 2$ symplectic matrices},
     journal = {The electronic journal of linear algebra},
     pages = {274--280},
     publisher = {mathdoc},
     volume = {18},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2009__18__a34/}
}