Rouhani, Shahin, and Nicholas H Barton. “The Probability of Peak Shifts in a Founder Population.”https://doi.org/10.1016/S0022-5193(87)80100-5__Journal of Theoretical Biology. Elsevier, 1987.https://doi.org/10.1016/S0022-5193(87)80100-5 .

Barton, Nicholas H, and Shahin Rouhani. “The Frequency of Shifts between Alternative Equilibria.”https://doi.org/10.1016/S0022-5193(87)80210-2__Journal of Theoretical Biology. Elsevier, 1987.https://doi.org/10.1016/S0022-5193(87)80210-2 .

Barton, Nicholas H, and R.J. Post. “Sibling Competition and the Advantage of Mixed Families.”https://doi.org/10.1016/S0022-5193(86)80033-9__Journal of Theoretical Biology. Elsevier, 1986.https://doi.org/10.1016/S0022-5193(86)80033-9 .