@article{NUMA_1961__3_131479,
     author = {L. COLLATZ},
     title = {Monotonie und {Extremalprinzipien} beim {Newtonschen} {Verfahren.}},
     journal = {Numerische Mathematik},
     pages = {99--106},
     publisher = {mathdoc},
     volume = {3},
     year = {1961},
     zbl = {0102.33303},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1961__3_131479/}
}