@article{INTO_2006_110_a8,
     author = {R. Hildebrand},
     title = {An open problem of optimal control theory},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {197--264},
     publisher = {mathdoc},
     volume = {110},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2006_110_a8/}
}