An optimal rounding gives a better approximation for scheduling unrelated machines.

Evgeny V. Shchepin Nodari Vakhania An optimal rounding gives a better approximation for scheduling unrelated machines. 127-133 2005 33 Oper. Res. Lett. 2 http://dx.doi.org/10.1016/j.orl.2004.05.004 db/journals/orl/orl33.html#ShchepinV05