Doblhammer, Gabriele, Nadja Milewski, and Frederik Peters. “Monitoring of German Fertility: Estimation of Monthly and Yearly Total Fertility Rates on the Basis of Preliminary Monthly Data”. Comparative Population Studies 35, no. 2 (February 10, 2011). Accessed April 19, 2024. https://www.comparativepopulationstudies.de/index.php/CPoS/article/view/32.