@article{GDZPPN002292017, title = {Problems in Linked Operators. I.}, journal = {Mathematische Annalen}, volume = {152}, year = {1963}, pages = {272-282}, zbl = {0123.31103}, url = {http://dml.mathdoc.fr/item/GDZPPN002292017} }
CARROLL, R. Problems in Linked Operators. I.. Mathematische Annalen, Tome 152 (1963) pp. 272-282. http://gdmltest.u-ga.fr/item/GDZPPN002292017/