Conference Paper
Scheuerlein, A.; Gwinner, E.: Proximate and ultimate aspects of photoperiodic sensitivity in equatorial Stonechats Saxicola torquata axillaris. In: Proceedings of the 22nd International Ornithological Congress, pp. 1756 - 1766 (Eds. Adams, N. J.; Slotow, R. H.). 22nd International Ornithological Congress, Durban, August 16, 1998 - August 22, 1998. Birdlife South Africa, Johannesburg (1999)