@article{NUMA_1973__21_132221,
     author = {K.P. Hadeler and D. Braess},
     title = {Simultaneous {Inclusion} of the {Zeros} of a {Polynomial.}},
     journal = {Numerische Mathematik},
     pages = {161--165},
     publisher = {mathdoc},
     volume = {21},
     year = {1973},
     zbl = {0267.65036},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1973__21_132221/}
}