Luetcke, H., Merboldt, K. D., & Frahm, J. (2006). The cost of parallel imaging in functional MRI of the human brain. Magnetic Resonance Imaging, 24, 1-5. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T9D-4HVDYSB-4-2&_cdi=5112&_user=38661&_orig=browse&_coverDate=01%2F31%2F2006&_sk=999759998&view=c&wchp=dGLzVtz-zSkWz&md5=8ea9865612f08759a91b4ae90039404b&ie=/sdarticle.pdf.