Evolution of the mouse polyubiquitin C gene
A. Perelygin, F. Kondrashov, I. Rogozin, M. Brinton, Journal of Molecular Evolution 55 (2002) 202–210.

Phylogeny, genome evolution, and host specificity of single-stranded RNA bacteriophage (Family Leviviridae)
J.P. Bollback, J. Huelsenbeck, Journal of Molecular Evolution 52 (2001) 117–128.