@article {15234,
	title = {The numerical range of elementary operators II},
	journal = {Linear Algebra Appl.},
	volume = {338},
	year = {2001},
	pages = {239-244},
	abstract = {For A,B ∈ L(H) (the algebra of all bounded linear operators on the Hilbert space H),it is proved that: (i) the generalized derivation δA,B is convexoid if and only if A and B areconvexoid; (ii) the operators δA,B and δA,B|Cp (where p  1) have the same numerical rangeand are equal to W0(A) - W0(B) (where Cp is the Banach space of the p-Schatten classoperators on H).},
	author = {Seddik. A}
}
