TY - CHAP A1 - Willekens, F.J. T1 - The life course: models and analysis Y1 - 1999 A3 - Dykstra, P.A. A3 - Van Wissen, L.J.G. T2 - Population Issues: An Interdisciplinary Focus CY - New York PB - Kluwer Academic SP - 23 EP - -52 ER -