@article{NUMA_1980__36_132703,
     author = {W. Gander},
     title = {Least {Squares} with a {Quadratic} {Constraint.}},
     journal = {Numerische Mathematik},
     pages = {291--308},
     publisher = {mathdoc},
     volume = {36},
     year = {1980},
     zbl = {0437.65031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__36_132703/}
}