Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1971__18_132090, author = {G.W. Stewart}, title = {On a {Companion} {Operator} for {Analytic} {Functions.}}, journal = {Numerische Mathematik}, pages = {26--43}, publisher = {mathdoc}, volume = {18}, year = {1971}, zbl = {0211.18805}, url = {http://geodesic.mathdoc.fr/item/NUMA_1971__18_132090/} }
G.W. Stewart. On a Companion Operator for Analytic Functions.. Numerische Mathematik, Tome 18 (1971), pp. 26-43. http://geodesic.mathdoc.fr/item/NUMA_1971__18_132090/