@article{MET_1981__28_175828,
     author = {A. Bachem and B. K\"orte},
     title = {Estimating {Matrices.}},
     journal = {Metrika},
     pages = {273--286},
     publisher = {mathdoc},
     volume = {28},
     year = {1981},
     zbl = {0478.62040},
     url = {http://geodesic.mathdoc.fr/item/MET_1981__28_175828/}
}