@article{TIMM_2011_17_2_a1,
     author = {V. I. Berdyshev},
     title = {Object and observer: {A~surveillance} problem},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {7--19},
     year = {2011},
     volume = {17},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2011_17_2_a1/}
}