1、The Saving of the Elderly in Micro and Macro Data
      David N. Weil  1994 The MIT Press.
http://www.jstor.org/pss/2118428

2、Dependency Rates and Savings Rates,
         by Nathaniel H. Leff
    1969 American Economic Association.
http://www.jstor.org/pss/1810683

3、Is the UK Balance of Payments Sustainable?,
by John Muellbauer, Anthony Murphy, Mervyn King and Marco Pagano
1990 Centre for Economic Policy Research, Center for Economic Studies and Maison des Sciences de l'Homme.
http://www.jstor.org/pss/1344481

4、Deregulation and Consumption: Saving Dynamics in the Nordic Countries,
        by Olli-Pekka Lehmussaari
   © 1990 International Monetary Fund.
http://www.jstor.org/pss/3867304