Similar title to
Westlund, A., Ermolieva, T.Y., & MacKellar, F.L.
(2000).
Analysis and forecasting of social security: A study of robustness.
In:
Financial Modeling.
Eds. Bonilla, M., Casasus, T., & Sala, R.,
Heidelberg: Physica-Verlag.
ISBN 3-7908-1282-X