@article{MZ_1972__124_171669, author = {Vasile I. Istratescu}, title = {On a {Class} of {Normaloid} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {199--202}, publisher = {mathdoc}, volume = {124}, year = {1972}, zbl = {0216.16703}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171669/} }