title = {A unified approach to approximation problems for NP- and PSPACE-hard problems for geometric graphs},
author = {Harry B. Hunt III and Madhav V. Marathe and Venkatesh Radhakrishnan and S. S. Ravi and Daniel J. Rosenkrantz and Richard E. Stearns},
journal = {J. Algorithms},
volume = {26},
number = {2},
pages = {238--274},
month = {Feb},
year = {1998}}

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