@article{AIHPC_1999__16_5_593_0,
     author = {Marcus, Moshe and Zaslavski, Alexander J.},
     title = {The structure of extremals of a class of second order variational problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {593--629},
     publisher = {Gauthier-Villars},
     volume = {16},
     number = {5},
     year = {1999},
     mrnumber = {1712568},
     zbl = {0989.49003},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1999__16_5_593_0/}
}