1. The circadian rhythm of body temperature as a function of body size;Aschoff;A companion to animal physiology,1982
2. Whats hot and whats not: defining torpor in free-ranging birds and mammals;Barclay;Can. J. Zool,2001
3. Life in the cold: evolution, mechanisms, adaptation and application
4. Temperature regulation in the speckled mousebird, Colius striatus;Bartholomew;Condor,1970
5. Multi-Model Inference ‘MuMIn’. - R package https://cran.r-project.org/web/packages/MuMIn/index.html