Albert, F. W., Shchepina, O., Winter, C., Römpler, H., Teupser, D., Palme, R., et al. (2008). Phenotypic differences in behavior, physiology and neurochemistry between rats selected for tameness and for defensive aggression towards humans. Hormones and Behavior, 53(3), 413-421. doi:10.1016/j.yhbeh.2007.11.010.