@article{CMJ_2005__55_2_a19,
     author = {Ferrer, Jes\'us},
     title = {A polynomial of degree four not satisfying {Rolle{\textquoteright}s} {Theorem} in the unit ball of $l_2$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {499--501},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {2005},
     mrnumber = {2137156},
     zbl = {1081.46030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_2_a19/}
}