@article{PORMA_1995__52_4_47404,
     author = {Sequeira, Fernando Manuel},
     title = {The spaces  and the symbolic calculus of {Sebasti\~ao} e {Silva.} {(Les} espaces  et le calcul symbolique de {Sebasti\~ao} e {Silva.)}},
     journal = {Portugaliae mathematica},
     pages = {409--439},
     publisher = {mathdoc},
     volume = {52},
     number = {4},
     year = {1995},
     zbl = {0838.46017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1995__52_4_47404/}
}