Do subspecies of bluethroat Luscinia svecica show a geographic segregation during the autumn migration period in Spain?

1. Arizaga, J.
2. Alonso, D.
3. Campos, F.
4. Unamuno, J.M.
5. Monteagudo, A.
6. Fernández, G.
7. Carregal, X.M.
8. Barba, E.