Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1971__30_1_115136, author = {Johnson, William B. and Shive, Robert A. jr.}, title = {Linear contraction mappings}, journal = {Portugaliae mathematica}, pages = {41--44}, publisher = {mathdoc}, volume = {30}, number = {1}, year = {1971}, mrnumber = {0305022}, zbl = {0228.47004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115136/} }
Johnson, William B.; Shive, Robert A. jr. Linear contraction mappings. Portugaliae mathematica, Tome 30 (1971) no. 1, pp. 41-44. http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115136/