Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1956__15_3_114773, author = {Swingle, Paul M.}, title = {Local properties and sums of trajectories}, journal = {Portugaliae mathematica}, pages = {89--103}, publisher = {mathdoc}, volume = {15}, number = {3}, year = {1956}, mrnumber = {0087928}, zbl = {0071.38503}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1956__15_3_114773/} }
Swingle, Paul M. Local properties and sums of trajectories. Portugaliae mathematica, Tome 15 (1956) no. 3, pp. 89-103. http://geodesic.mathdoc.fr/item/PORMA_1956__15_3_114773/