Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1976__26_132404, author = {H. Schneider and B.D. Saunders}, title = {A {Symmetric} {Numerical} {Range} for {Matrices.}}, journal = {Numerische Mathematik}, pages = {99--106}, publisher = {mathdoc}, volume = {26}, year = {1976}, zbl = {0312.65034}, url = {http://geodesic.mathdoc.fr/item/NUMA_1976__26_132404/} }
H. Schneider; B.D. Saunders. A Symmetric Numerical Range for Matrices.. Numerische Mathematik, Tome 26 (1976), pp. 99-106. http://geodesic.mathdoc.fr/item/NUMA_1976__26_132404/