@article{DAN_1975_224_2_a8,
     author = {R. G. Nigmatullin},
     title = {Complexity of approximate solution of combinatorial problems},
     journal = {Doklady Akademii Nauk},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {224},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_2_a8/}
}