@article{2283, author = {Swingle, Paul M.}, title = {Local properties and sums of trajectories}, journal = {Portugaliae mathematica}, volume = {15}, year = {1956}, pages = {89-103}, zbl = {0071.38503}, mrnumber = {0087928}, language = {en}, url = {http://dml.mathdoc.fr/item/2283} }
Swingle, Paul M. Local properties and sums of trajectories. Portugaliae mathematica, Tome 15 (1956) pp. 89-103. http://gdmltest.u-ga.fr/item/2283/