@article{NUMA_1982__39_132782,
     author = {A.J. Geurts},
     title = {A {Contribution} to the {Theory} of {Condition.}},
     journal = {Numerische Mathematik},
     pages = {85--96},
     publisher = {mathdoc},
     volume = {39},
     year = {1982},
     zbl = {0465.65025},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__39_132782/}
}