@article{01184382, title = {On approximating NP-hard optimization problems.}, journal = {Documenta Mathematica}, year = {1998}, pages = {441-450}, zbl = {0910.68093}, language = {en}, url = {http://dml.mathdoc.fr/item/01184382} }
Håstad, Johan. On approximating NP-hard optimization problems.. Documenta Mathematica, (1998), pp. 441-450. http://gdmltest.u-ga.fr/item/01184382/