%0 Journal Article %A Vincent Colin %A Sheila Sandon %T The discriminant and oscillation lengths for contact and Legendrian isotopies %J Journal of the European Mathematical Society %D 2015 %P 1657-1685 %V 17 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/542/ %R 10.4171/jems/542 %F JEMS_2015_17_7_a4