TY - JOUR A1 - Billari, F. A1 - Borgoni, R. T1 - Assessing the use of sample selection models in the estimation of fertility postponement effects Y1 - 2005 DO - 10.1007/s10260-005-0122-x JF - Statistical Methods and Applications VL - 14 IS - 3 SP - 389 EP - -402 ER -