@article{MT_1988_10_a2,
     author = {V. A. Bulavskii},
     title = {Feedback in optimization problems},
     journal = {Matemati\v{c}eskie trudy},
     pages = {55--63},
     publisher = {mathdoc},
     volume = {10},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1988_10_a2/}
}