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@article{MZ_1966__94_170636, author = {Werner C. Rheinboldt}, title = {On a {General} {Estimation} {Principle} and a {Theory} of {Comparison} {Factors.}}, journal = {Mathematische Zeitschrift}, pages = {396--414}, publisher = {mathdoc}, volume = {94}, year = {1966}, zbl = {0194.09102}, url = {http://geodesic.mathdoc.fr/item/MZ_1966__94_170636/} }
Werner C. Rheinboldt. On a General Estimation Principle and a Theory of Comparison Factors.. Mathematische Zeitschrift, Tome 94 (1966), pp. 396-414. http://geodesic.mathdoc.fr/item/MZ_1966__94_170636/