Dirk Mayer, Yi-Fen Yen, Yakir S. Levin, James Tropp, Adolf Pfefferbaum, Ralph E. Hurd, and Daniel M. Spielman. “In vivo application of sub-second spiral chemical shift imaging (CSI) to hyperpolarized 13C metabolic imaging: comparison with phase-encoded CSI.” Journal of Magnetic Resonance (San Diego, Calif.: 1997), 204, 2, Pp. 340–345.