@article{2277, author = {Silveira, M. da}, title = {General operational calculus in n variables}, journal = {Portugaliae mathematica}, volume = {15}, year = {1956}, pages = {49-69}, zbl = {0074.09604}, mrnumber = {0083693}, language = {en}, url = {http://dml.mathdoc.fr/item/2277} }
Silveira, M. da. General operational calculus in n variables. Portugaliae mathematica, Tome 15 (1956) pp. 49-69. http://gdmltest.u-ga.fr/item/2277/