@article{DA_2015_22_4_a1,
     author = {A. I. Erzin and N. A. Shabelnikova},
     title = {About density of a~covering of a~strip with identical sectors},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {21--34},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2015_22_4_a1/}
}