1. Anderson, R. W.: Perfect price aggregation and empirical demand analysis. Econometrica47, 1209?1230 (1979)
2. Blackorby, C., Davidson, R., Schworm W.: Implicit separability: Characterisation and implications for consumer demands. Journal of Economic Theory55, 364?399 (1991)
3. Blackorby, C., Diewert, W. E.: Expenditure functions, local duality, and second order approximations. Econometrica47, 579?601 (1979)
4. Blackorby, C., Primont, D., Russell, R.: An extension and alternative proof of Gorman's price aggregation theorem. In: W. Eichorn (ed.) Theory and applications of economic indices. Würzburg Wien: Physica 1978a
5. Blackorby, D., Primont, D., Russell, R.: Duality, separability, and functional structure: Theory and economic applications. New York Amsterdam: North-Holland 1978b