%0 Journal Article %A Philip E.B. Jourdain %T On those Principles of Mechanics which depend upon Processes of Variation %J Mathematische Annalen %D 1908 %P 513-527 %V 65 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1908__65_158359/ %F MAN_1908__65_158359