TY  - CHAP
A1  - Murphy, M.
A1  - Berrington, A.
T1  - Constructing period parity progression ratios from household survey data
Y1  - 1993
A3  - Ní Bhrolcháin, M.
T2  - New Perspectives on Fertility in Britain
CY  - London
PB  - HMSO
SP  - 17
EP  - -32

ER  -