@article {aja2014noise,
	title = {Noise estimation in parallel MRI: GRAPPA and SENSE},
	journal = {Magnetic resonance imaging},
	volume = {32},
	number = {3},
	year = {2014},
	pages = {281{\textendash}290},
	publisher = {Elsevier},
	author = {Santiago Aja-Fern{\'a}ndez and Gonzalo Vegas-S{\'a}nchez-Ferrero and Antonio Trist{\'a}n-Vega}
}
