@article{DA_2020_27_3_a4,
     author = {V. P. Il'ev and S. D. Il'eva and A. V. Morshinin},
     title = {$2${-Approximation} algorithms for~two~graph~clustering~problems},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {88--108},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2020_27_3_a4/}
}