TY - JOUR A1 - Kreyenfeld, M. A1 - Zeman, K. A1 - Burkimsher, M. A1 - Jaschinski, I. T1 - Fertility data for German-speaking Countries: What is the potential? Where are the pitfalls? Y1 - 2012 DO - 10.12765/CPoS-2011-06 VL - 36 IS - 2–3 ER -