1. Multiple Pregnancies;Benirschke's Pathology of the Human Placenta;2021-12-08
2. Twinning Rates in Isolates;Twin Research and Human Genetics;2016-09-27
3. Temporal and Spatial Variations in the Twinning Rate in Norway;Twin Research and Human Genetics;2016-06-24
4. Chapter 25 Multiple Pregnancies;Pathology of the Human Placenta;2012
5. Multiple Pregnancies;Pathology of the Human Placenta;2012