@article{IVM_1981_5_a2,
     author = {R. G. Nigmatullin},
     title = {The problem of lower bounds of complexity and the theory of {NP-completeness} (survey)},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {17--25},
     publisher = {mathdoc},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_5_a2/}
}