1. Avoiding pitfalls when using information-theoretic methods;Anderson;J. Wildl. Manage.,2002
2. Null hypothesis testing: problems, prevalence, and an alternative;Anderson;J. Wildl. Manage.,2000
3. Bartoń , K. 2009 MuMIn: multi-model inference. R package, version 0.12.2 http://r-forge.r-project.org/projects/mumin/
4. Bates , D. Maechler , M. 2009 lme4: Linear mixed-effects models using S4 classes. R package, version 0.999375-31 http://CRAN.R-project.org/package=lme4