@article{NUMA_1972__20_132180,
     author = {Martin Gutknecht},
     title = {A posteriori {Error} {Bounds} for the {Zeros} of a {Polynomial.}},
     journal = {Numerische Mathematik},
     pages = {139--148},
     publisher = {mathdoc},
     volume = {20},
     year = {1972},
     zbl = {0235.65034},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__20_132180/}
}