@article{NUMA_1990__57_6-7_133473,
     author = {H. Berens and M. Finzel},
     title = {A {Continuous} {Selection} of the {Metric} {Projection} in {Matrix} {Spaces,} {Addendum.}},
     journal = {Numerische Mathematik},
     pages = {663--668},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0703.41034},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133473/}
}