Stephan, W; Chao, L; Smale, J G (1993) The advance of Muller's ratchet in a haploid asexual population: approximate solutions based on diffusion theory. Genet Res 61:225-31 |
Chao, L (1991) Levels of selection, evolution of sex in RNA viruses, and the origin of life. J Theor Biol 153:229-46 |