@article{DAN_1993_333_6_a0,
     author = {A. S. Antipin},
     title = {Controlled gradient saddle differential systems},
     journal = {Doklady Akademii Nauk},
     pages = {693--695},
     publisher = {mathdoc},
     volume = {333},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_6_a0/}
}