Martin W. P. Savelsbergh R. N. Uma Joel Wein An Experimental Study of LP-Based Approximation Algorithms for Scheduling Problems. 123-136 2005 17 INFORMS Journal on Computing 1 http://dx.doi.org/10.1287/ijoc.1030.0055 db/journals/informs/informs17.html#SavelsberghUW05