@article{GDZPPN002028379, title = {Monotonieeigenschaften des Steffensen-Verfahrens.}, journal = {Aequationes mathematicae}, volume = {13}, year = {1975}, pages = {21-31}, zbl = {0298.65036}, url = {http://dml.mathdoc.fr/item/GDZPPN002028379} }
Hofmann, Wolf. Monotonieeigenschaften des Steffensen-Verfahrens.. Aequationes mathematicae, Tome 13 (1975) pp. 21-31. http://gdmltest.u-ga.fr/item/GDZPPN002028379/