Ameen, Nihad A., and Nihad A. Ameen. “The Inheritance of Elbow Crease Trait in a Group of Families in Erbil City Iraq”. Journal of Biotechnology Research Center (JOBRC), vol. 7, no. 2, June 2013, pp. 11-16, doi:10.24126/jobrc.2013.7.2.258.