@article{INTD_1983_22_a0,
     author = {V. I. Arnol'd},
     title = {Singularities in the calculus of variations},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {3--55},
     publisher = {mathdoc},
     volume = {22},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTD_1983_22_a0/}
}