@article{ZNSL_2003_299_a4,
     author = {V. A. Zalgaller},
     title = {On a~question of {Bellman}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {54--86},
     publisher = {mathdoc},
     volume = {299},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_299_a4/}
}