Simultaneous estimation of $I_0$, $R_2^*$, and field map using a multi-echo spiral acquisition. Sutton, B. P., Peltier, S. J., Fessler, J. A., & Noll, D. C. 2002.
Simultaneous estimation of $I_0$, $R_2^*$, and field map using a multi-echo spiral acquisition [pdf]Paper  bibtex   

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