//-->
A positive theory of social security
Tabellini, Guido Enrico, (1990)
Pension reform : redistribution and risk
Weale, Martin, (2003)
Product differentiation and preference structure : a note on hotelling's spatial competition model
Chu, Cyrus C. Y., (1986)
Population density and infrastructure development
Chu, Cyrus C. Y., (1997)
Age-distribution dynamics and aging indexes