Lindborg, R., Helm, A., Bommarco, R., Heikkinen, R.K., Kühn, I., Pykälä, J. & Pärtel, M. (2012) Effect of habitat area and isolation on plant trait distribution in European forests and grasslandsEcography 35(4): 356–363. http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0587.2011.07286.x/abstract