Dorbritz, Jürgen, and Robert Naderi. 2013. “Stability of Bilocal Relationships – Conditions and Development PathsAn Analysis of the First and Second Wave of Pairfam”. Comparative Population Studies 37 (3-4). Wiesbaden, Germany. https://www.comparativepopulationstudies.de/index.php/CPoS/article/view/106.