1. Tachibanaki and Shimono , op. cit.
2. Labor supply of the elderly;Tachibanaki;keizai kenkyuu,1985
3. Labour force participation rates in Australia and selected countries: the effects on age structures;Shannon;Social Security Journal,1985
4. Furuya K. and Martin L. G. , Employment and Retirement of Older Workers in Japan. Nihon University Population Research Institute Paper Series No. 8, 12, 1981, p. 2.