@article{GDZPPN00117715X, title = {A Contribution to the Theory of Condition.}, journal = {Numerische Mathematik}, volume = {39}, year = {1982}, pages = {85-96}, zbl = {0465.65025}, url = {http://dml.mathdoc.fr/item/GDZPPN00117715X} }
Geurts, A.J. A Contribution to the Theory of Condition.. Numerische Mathematik, Tome 39 (1982) pp. 85-96. http://gdmltest.u-ga.fr/item/GDZPPN00117715X/