@article{GDZPPN002298155,
title = {Ascent, Descent, Nullity and Defect, a Note on a Paper by A.E. Taylor},
journal = {Mathematische Annalen},
volume = {174},
year = {1967},
pages = {105-115},
zbl = {0152.33803},
url = {http://dml.mathdoc.fr/item/GDZPPN002298155}
}
Kaashoek, M.A. Ascent, Descent, Nullity and Defect, a Note on a Paper by A.E. Taylor. Mathematische Annalen, Tome 174 (1967) pp. 105-115. http://gdmltest.u-ga.fr/item/GDZPPN002298155/