@article{NUMA_1991__59_8_133551,
     author = {Yves Nievergelt},
     title = {Aitken's and {Steffensen's} accelerations in several variables.},
     journal = {Numerische Mathematik},
     pages = {295--310},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0712.65037},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133551/}
}