1. Determination of deforestation rates of the world’s humid tropical forests;Achard;Science,2002
2. Migrating Raptors of the World: Their Ecology and Conservation;Bildstein,2006
3. Applied Spatial Data Analysis with R;Bivand,2013
4. Bivand, R., Rundel, C., 2020. Rgeos: Interface to Geometry Engine - Open Source (’GEOS’). 〈https://CRAN.R-project.org/package=rgeos〉.
5. The Flyway Concept: What it is and what it isn’t. In Waterbirds Around the World;Boere,2006