@article{DE_1995_31_11_a11,
     author = {A. V. Pukhlikov},
     title = {Degenerations of {Hamiltonian} structures in optimal control problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1874--1879},
     year = {1995},
     volume = {31},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_11_a11/}
}