TY - JOUR AU - Marcus, Moshe AU - Zaslavski, Alexander J. TI - The structure of extremals of a class of second order variational problems JO - Annales de l'I.H.P. Analyse non linéaire PY - 1999 SP - 593 EP - 629 VL - 16 IS - 5 PB - Gauthier-Villars UR - http://archive.numdam.org/item/AIHPC_1999__16_5_593_0/ LA - en ID - AIHPC_1999__16_5_593_0 ER -