Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1968__72_177413, author = {B.-Ch. Chang and J.W. Smith}, title = {The {Extension} {Problem} for {Functions} {Invariant} under a {Group.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {118--132}, publisher = {mathdoc}, volume = {72}, year = {1968}, zbl = {0159.53001}, url = {http://geodesic.mathdoc.fr/item/MOMA_1968__72_177413/} }
B.-Ch. Chang; J.W. Smith. The Extension Problem for Functions Invariant under a Group.. Monatshefte für Mathematik, Tome 72 (1968), pp. 118-132. http://geodesic.mathdoc.fr/item/MOMA_1968__72_177413/