1. Aghion, Ph. and Howitt, P., Endogeneous Growth Theory, Cambridge, MA: MIT Press, 1998.
2. Asheim, G., Ethical Preferences in the Presence of Resource Constraints, Nord. J. Political Economy, 1996, vol. 23, pp. 55–67.
3. Asheim, G., Justifying, Characterizing and Indicating Sustainability, Dordrecht: Springer Netherlands, 2007.
4. Bardi, M. and Capuzzo-Dolcetta, I., Optimal Control and Viscosity Solutions of Hamilton — Jacobi — Bellman Equations, Boston, MA: Birkhäuser, 1997.
5. Barro, R. and Sala-i-Martin, X., Economic Growth, 2nd ed., Cambridge, MA: MIT Press, 2003.