@article{CMFD_2006_19_a0,
     author = {V. F. Borisov},
     title = {Kelley {Condition} and {Structure} of {Lagrange} {Manifold} in {a~Neighborhood} of {a~First-Order} {Singular} {Extremal}},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {5--44},
     publisher = {mathdoc},
     volume = {19},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2006_19_a0/}
}