@article {yu_parametric_1991,
	title = {Parametric yield optimization of CMOS analogue circuits by quadratic statistical circuit performance models},
	journal = {International journal of circuit theory and applications},
	volume = {19},
	number = {6},
	year = {1991},
	pages = {579{\textendash}592},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/cta.4490190606/abstract},
	author = {Yu, T. K. and Kang, S. M. and Sacks, J. and Welch, W. J.}
}
