His Spatial population analysis, 1978: t.p. (Frans Willekens)

Demographic research and spatial policy, 1984: CIP t.p. (Frans J. Willekens, Netherlands Interuniversity Demographic Inst. (NIDI), Voorburg)

nuc88-25423: Multistate analysis of marital ... 1980 (hdg. on NIC rept.: Willekens, F.; usage: F. Willekens)