@article {aja2011statistical,
	title = {Statistical noise analysis in GRAPPA using a parametrized noncentral Chi approximation model},
	journal = {Magnetic resonance in medicine},
	volume = {65},
	number = {4},
	year = {2011},
	pages = {1195{\textendash}1206},
	publisher = {Wiley Subscription Services, Inc., A Wiley Company},
	author = {Santiago Aja-Fern{\'a}ndez and Antonio Trist{\'a}n-Vega and W Scott Hoge}
}
