Nyberg Berglund et al. 2004. Evidence for parallel evolution and site-specific selection of serpentine tolerance in Cerastium alpinum during the colonization of Scandinavia. New Phytologist, Volume 161, Issue 1, pages 199–209, January 2004. http://onlinelibrary.wiley.com/doi/10.1046/j.1469-8137.2003.00934.x/full
