1.
H. Abood E, A. H. M. The Spectrum and The Numerical Range of W_f,φ W_f,ψ* and W_f,ψ* W_f,φ. JPRM [Internet]. 7Jul.2016 [cited 6May2024];8(2):1258-6. Available from: http://scitecresearch.com/journals/index.php/jprm/article/view/804