@article{GDZPPN002295571, title = {Theorems on Ascent, Descent, Nullity and Defect of Linear Operators.}, journal = {Mathematische Annalen}, volume = {163}, year = {1966}, pages = {18-49}, zbl = {0138.07602}, url = {http://dml.mathdoc.fr/item/GDZPPN002295571} }
Taylor, A.E. Theorems on Ascent, Descent, Nullity and Defect of Linear Operators.. Mathematische Annalen, Tome 163 (1966) pp. 18-49. http://gdmltest.u-ga.fr/item/GDZPPN002295571/