Weitzman ML, Manove M.
Aggregation for Material Balances. Journal of Comparative Economics. 1978;March, 2 (1) :1-11.
aggregationmaterialbalances.pdf Weitzman ML, Spence AM.
Regulatory Strategies for Pollution Control. In:
Friedlaender AF Approaches to Controlling Air Pollution. Vol. April. Cambridge, MA, London, UK: M.I.T. Press ; 1978.
MIT Press Book regulstratpollutioncontrol.pdf 