1. Homing pigeons' behaviour in the irregular magnetic field of Western Switzerland;Frei,1982
2. Die Anfangsorientierung von Brieftauben im erdmagnetisch gestörten Gebiet des Mont Jorat;Frei;Rev. suisse zool.,1976
3. Initial orientation in pigeon homing related to magnetic contours;Graue;Am. Zool.,1965
4. Normal fluctuations in the earth's magnetic field influence pigeon orientation;Keeton;J. Comp. physiol.,1974
5. Bar magnets mask the effect of normal magnetic disturbances on pigeon orientation;Larkin;J. Comp. Physiol.,1976