Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1973__32_2_115196, author = {Smithson, R.E.}, title = {M-isometries}, journal = {Portugaliae mathematica}, pages = {109--113}, publisher = {mathdoc}, volume = {32}, number = {2}, year = {1973}, mrnumber = {0321029}, zbl = {0255.54012}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1973__32_2_115196/} }
Smithson, R.E. M-isometries. Portugaliae mathematica, Tome 32 (1973) no. 2, pp. 109-113. http://geodesic.mathdoc.fr/item/PORMA_1973__32_2_115196/