@article{DA_2009_16_3_a0,
     author = {S. N. Astrakov and A. I. Erzin and V. V. Zalyubovskiy},
     title = {Sensor networks and covering of plane by discs},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {3--19},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2009_16_3_a0/}
}