%0 Journal Article %A Do, Thoan %A Prince, Geoff %T The inverse problem in the calculus of variations: new developments %J Communications in Mathematics %D 2021 %P 131-149 %V 29 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/COMIM_2021__29_1_a7/ %G en %F COMIM_2021__29_1_a7