@inbook {Vava:poly,
	title = {Polynomial time weak approximation algorithms for quadratic programming},
	booktitle = {Complexity in Numerical Optimization},
	year = {1993},
	pages = {490{\textendash}500},
	publisher = {World Scientific},
	organization = {World Scientific},
	author = {Vavasis, S. A.},
	editor = {P. M. Pardalos}
}