@article{LP04, 
	Author = {Logothetis, N.K. and Pfeuffer, J.},
	Title = {On the nature of the {BOLD} f{MRI} contrast mechanism},
	Journal = {Magn Reson Imaging},
	Volume = {22},
	Number = {10},
	Pages = {1517--1531},
	Year = {2004}
}