  M. Grötschel, L. Lovász, and A. Schrijver. Polynomial algorithms for perfect graphs. Annals of Discrete Mathematics , 00:000-000, 0000. MathSciNetMATH  A.L. Guedes, F.D. Moura Neto, and G.M. Platt. Double Azeotropy: Calculations with Newton-like methods and continuous GRASP (C-GRASP). International Journal of Mathematical Modelling and Numerical Optimisation