Loeb, Abraham; Batista, Rafael; Sloan, David. (agosto de 2016). «Relative Likelihood for Life as a Function of Cosmic Time» Journal of Cosmology and Astroparticle Physicsdoi:10.1088/1475-7516/2016/08/040. Bibcode: 2016JCAP...08..040L..
Loeb, Abraham; Batista, Rafael; Sloan, David. (agosto de 2016). «Relative Likelihood for Life as a Function of Cosmic Time» Journal of Cosmology and Astroparticle Physicsdoi:10.1088/1475-7516/2016/08/040. Bibcode: 2016JCAP...08..040L..