@article{MAN_1967__172_161574,
     author = {M.A. Kaashoek},
     title = {Ascent, {Descent,} {Nullity} and {Defect,} a {Note} on a {Paper} by {A.E.} {Taylor}},
     journal = {Mathematische Annalen},
     pages = {105--115},
     publisher = {mathdoc},
     volume = {172},
     year = {1967},
     zbl = {0152.33803},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__172_161574/}
}