Ullmann, Reinhard Molecular Cytogenetics (Reinhard Ullmann), Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society;
Jakobsen, L. P., Ullmann, R., Christensen, S. B.., Jensen, K. E., Mølsted, K., Henriksen, K. F.., et al. (2007). Pierre Robin sequence may be caused by dysregulation of SOX9 and KCNJ2. Druckausga, 44(6), 381-386. doi:10.1136/jmg.2006.046177.