1. Adami C (2002) What is complexity? BioEssays 24:1085–1094
2. Baross J (2007) The limits of organic life in planetary systems. National Academies Press, Washington DC
3. Beatty J (1995) The evolutionary contingency thesis. In: Wolters G, Lennox J (eds) Concepts, theories and rationality in the biological sciences. University of Pittsburgh Press, Pittsburgh, pp 45–81
4. Bedau M (1996) The nature of life. In: Boden M (ed) The philosophy of artificial life. Oxford University Press, New York, pp 332–357
5. Boyd R (1991) Realism, anti-foundationalism and the enthusiasm for natural kinds. Philos Stud 61(1/2):127–148