1. Product differentiation, monopolistic competition and city size;Abdel-Rahman;Reg. Sci. Urban Econ.,1988
2. Product variety, Marshallian externalities and city size;Abdel-Rahman;J. Reg. Sci.,1990
3. Labor differentiation and agglomeration in general equilibrium;Berliant,2002
4. Economies with a finite set of equilibria;Debreu;Econometrica,1970
5. The application to economics of differential topology and global analysis: regular differentiable economies;Debreu;Amer. Econ. Rev.,1976