Wallraff, Hans Georg Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Wallraff, H. G. (1986). Directional components derived from initial-orientation data of inexperienced homing pigeons. Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology, 159(2), 143-159. doi:10.1007/bf00612298.