@article{VMUMM_1987_3_a12,
     author = {A. V. Brukhtii},
     title = {An optimality condition of {Goh} type for extremals that degenerate at a point},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {46--50},
     publisher = {mathdoc},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_3_a12/}
}