Uecker, M., Hohage, T., Block, T., & Frahm, J. (2008). Image reconstruction by regularized nonlinear inversion - Joint estimation of coil sensitivities and image content. Magnetic Resonance in Medicine, 60(3), 674-682. Retrieved from http://www3.interscience.wiley.com/cgi-bin/fulltext/121371072/HTMLSTART.