TY - JOUR A1 - Ní Bhrolcháin, M. T1 - Period parity progression ratios and birth intervals in England and Wales, 1941-1971: A synthetic life table analysis Y1 - 1987 DO - 10.1080/0032472031000142556 JF - Population Studies VL - 41 IS - 1 SP - 103 EP - -125 ER -