1. Rhythmic variations in energy metabolism;Aschoff;Fed. Proc.,1970
2. Physiology of Cold Adaptation in Birds;Bech,1989
3. Tempo and mode in evolution: phylogenetic inertia, adaptation and comparative methods;Blomberg;J. Evol. Biol.,2002
4. Thermal and caloric relation of birds;Calder,1974
5. Scaling of body temperature in mammals and birds;Clarke;Funct. Ecol.,2008