1. Baldaccini, N.E., Benvenuti, S., Fiaschi, V., Papi, F.: Pigeon navigation: Effect of wind deflection at home cage on homing behavior. J. Comp. Physiol. 99, 177–186 (1975)
2. Batschelet, E.: Statistical methods for the analysis of problems in animal orientation and certain biologigal rhythms. The Am. Inst. Biol. Sci., Wash. (1965)
3. Batschelet, E.: Recent statistical methods for orientation data. In: Animal Navigation and Orientation. Galler, R.S., Schmidt-Koenig, K., Jacobs, G.J., Belleville, R.E. (eds.) N.A.S.A. Adm. Wash. D.C. 1972
4. Papi, F., Fiaschi, V., Benvenuti, S., Baldaccini, NE.: Pigeon Homing: outward journey detours influence the initial orientation. Monit. Zool. Ital. (N.S.) 7, 129–133 (1973)
5. Wiltschko, W., Wiltschko, R.: The magnetic compass of European Robins. Science 176, 62–64 (1972)