1. Aristotle (1976) The Nicomachean ethics. Thomson JAK, Penguin Books, London
2. Arrow KJ (1963) Social choice and individual values, 2nd edn. John Wiley, New York
3. Bauer PT (1981) Equality, the Third World and economic delusion. Weidenfeld and Nicholson, London
4. Blackorby C, Donaldson D (1985) Social criteria for evaluating population change. J Publ Econ 28
5. Dasgupta P (1969). On the concept of optinum population. Rev Econ Stud 36