TY - JOUR AU - David Saunders TI - On Lagrangians with Reduced-Order Euler–Lagrange Equations JO - Symmetry, integrability and geometry: methods and applications PY - 2018 VL - 14 UR - http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a88/ LA - en ID - SIGMA_2018_14_a88 ER -