@article{NUMA_1961__3_131493,
     author = {P. L\"AUCHLI},
     title = {Jordan-Elimination und {Ausgleichung} nach kleinsten  {Quadraten.}},
     journal = {Numerische Mathematik},
     pages = {226--240},
     publisher = {mathdoc},
     volume = {3},
     year = {1961},
     zbl = {0117.10902},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1961__3_131493/}
}