I was given the following reprint at Dinofest by one of the authors: M. van Tuinen, C.G. Sibley, and S.B. Hedges. 1998. Phylogeny and biogeography of ratite birds inferred from DNA sequences of the mitochondrial ribosomal genes. Mol. Biol. Evol. 15: 370-376. I haven't read the paper carefully yet, but it sure looks interesting.