@article{10_4064_sm182_2_3,
     author = {Mohammad El-Haddad and Fuad Kittaneh},
     title = {Numerical radius inequalities for {Hilbert} space operators. {II}},
     journal = {Studia Mathematica},
     pages = {133--140},
     publisher = {mathdoc},
     volume = {182},
     number = {2},
     year = {2007},
     doi = {10.4064/sm182-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm182-2-3/}
}