@article{1103921281, author = {Powers, Robert T. and Price, Geoffrey}, title = {Derivations vanishing on $S(\infty)$}, journal = {Comm. Math. Phys.}, volume = {83}, number = {1}, year = {1982}, pages = { 439-447}, language = {en}, url = {http://dml.mathdoc.fr/item/1103921281} }
Powers, Robert T.; Price, Geoffrey. Derivations vanishing on $S(\infty)$. Comm. Math. Phys., Tome 83 (1982) no. 1, pp. 439-447. http://gdmltest.u-ga.fr/item/1103921281/