TY - JOUR A1 - Lutz, W. A1 - Skirbekk, V. A1 - Testa, M.R. T1 - The low-fertility trap hypothesis: Forces that may lead to further postponement and fewer births in Europe Y1 - 2006 DO - 10.1553/populationyearbook2006s115 JF - Vienna Yearbook for Population Research VL - 2006 SP - 167 EP - -192 ER -