Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1967__96_170679, author = {R.A. Hirschfeld}, title = {On {Hulls} of {Linear} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {216--222}, publisher = {mathdoc}, volume = {96}, year = {1967}, zbl = {0148.38404}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__96_170679/} }
R.A. Hirschfeld. On Hulls of Linear Operators.. Mathematische Zeitschrift, Tome 96 (1967), pp. 216-222. http://geodesic.mathdoc.fr/item/MZ_1967__96_170679/