Reference Request: Asymptotic hardness of $hk$ coloring $k$-colorable graphs I heard of a result in approximate graph coloring, but cannot find the source. The result is:

For every constant $h$ there exists a sufficiently large $k$ such that coloring a $k$-colorable graph with $hk$ colors is NP-hard.

Could someone please point me to the relevant paper?
Here are the references:


S. Khanna, N. Linial, and S. Safra, On the hardness of approximating the chromatic number,
Combinatoria, 20 (2000), pp. 393–415.
C. Lund and M. Yannakakis, On the hardness of approximating minimization problems, J.
ACM, 41 (1994), pp. 960–981.