@article{MZ_1968__103_170916,
     author = {G.M. Petersen},
     title = {Singularities for {Matrices} and {Sequences.}},
     journal = {Mathematische Zeitschrift},
     pages = {268--275},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170916/}
}