Gaur, A.K., and Husain, T.. "Spatial numerical ranges of elements of Banach algebras.." International Journal of Mathematics and Mathematical Sciences 12.4 (1989): 633-640. <http://eudml.org/doc/46565>.
@article{Gaur1989, author = {Gaur, A.K., Husain, T.}, journal = {International Journal of Mathematics and Mathematical Sciences}, keywords = {regular norm of a normed algebra; spatial numerical range of elements of Banach algebras without identity; spectra}, language = {eng}, number = {4}, pages = {633-640}, publisher = {Hindawi Publishing Corporation, New York}, title = {Spatial numerical ranges of elements of Banach algebras.}, url = {http://eudml.org/doc/46565}, volume = {12}, year = {1989}, }
TY - JOUR AU - Gaur, A.K. AU - Husain, T. TI - Spatial numerical ranges of elements of Banach algebras. JO - International Journal of Mathematics and Mathematical Sciences PY - 1989 PB - Hindawi Publishing Corporation, New York VL - 12 IS - 4 SP - 633 EP - 640 LA - eng KW - regular norm of a normed algebra; spatial numerical range of elements of Banach algebras without identity; spectra UR - http://eudml.org/doc/46565 ER -