@article{MOMA_1955__59_176961,
     author = {Ky Fan and Olga Taussky and John Todd},
     title = {Discrete analogs of inequalities of {Wirtinger.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {73--90},
     publisher = {mathdoc},
     volume = {59},
     year = {1955},
     zbl = {0064.29803},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1955__59_176961/}
}