1. The concepts and terminology of bird navigation;Able;Journal of Avian Biology,2001
2. Bird migration performance on the basis of flight mechanics and trigonometry;Alerstam,2000
3. Bird migration speed;Alerstam,2003
4. The development of bird migration theory;Alerstam;Journal of Avian Biology,1998
5. Optimal bird migration: the relative importance of time, energy and safety;Alerstam,1990