1. Adachi, J., K. Kosuge, T. Denda, and K. Watanabe. 1995. Phylogenetic relationships of the Berberidaceae based on partial sequences of the gapA gene. Plant Systematics and Evolution, 9(Suppl.):351–353.
2. Albert, V. A., A. Backlund, K. Bremer, M. W. Chase, J. R. Manhart, B. D. Mishler, and K. D. Nixon. 1994. Functional constraints and rbcL evidence for land plant phylogeny. Annals of the Missouri Botantical Garden 81:534–567.
3. Appels, R., and J. Dvorak. 1982. The wheat ribosomal DNA spacer region: its structure and variation in populations among species. Theoretical and Applied Genetics 63:337–348.
4. Appels, R., and R. L. Honeycutt. 1986. rDNA: evolution over a billion years. In DNA Systematics, Vol. II, Plants, ed. S. K. Dutta, pp. 81–135. CRC Press, Boca Raton, Florida.
5. Arnheim, N. 1983. Concerted evolution of multigene families. In Evolution of Genes and Gene Proteins, eds. M. Nei and R. K. Koehn, pp. 38–61. Sinauer Associates, Sunderland, Massachusetts.