@article{DOCMA_1998__S9__a35,
     author = {H\r{a}stad, Johan},
     title = {On approximating {NP-hard} optimization problems},
     journal = {Documenta mathematica},
     pages = {441--450},
     publisher = {mathdoc},
     volume = {ICM Berlin 1998, Vol. III},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1998__S9__a35/}
}