@article{FPM_2005_11_8_a5,
     author = {Yu. V. Bolotin and S. N. Morgunova},
     title = {Observability with bearing-only observations and smoothness of attainable set},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {119--130},
     publisher = {mathdoc},
     volume = {11},
     number = {8},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_8_a5/}
}