Voir la notice de l'article provenant de la source Hellenic Digital Mathematics Library
@article{EUG_1987__17_a6, author = {B. Bollobas and E. Galanis}, title = {An {Inequality} {Involving} a {Hermitian} {Operator} and its {Square} in a {Normed} {Space}}, journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma} }, pages = {44-49}, publisher = {mathdoc}, volume = {17}, year = {1987}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/EUG_1987__17_a6/} }
B. Bollobas; E. Galanis. An Inequality Involving a Hermitian Operator and its Square in a Normed Space. Ευκλείδης Γ , Tome 17 (1987), p. 44-49. http://geodesic.mathdoc.fr/item/EUG_1987__17_a6/