Schmeller, D. S. , Juillard, R., Bellingham, P. J., Böhm, M., Brummitt, N., Chiarucci, A., Couvet, D., Elmendorf, S., Forsyth, D. M., Garcia-Moreno, J., Gregory, R. D., Magnusson, W. E., Martin, L. J., McGeoch, M. A., Mihoub, J.-B., Pereira, H. M., Proença, V., Van Swaay, C., Yahara, T., & Belnap, J., 2015, Towards a global terrestrial species monitoring program, Journal for Nature Conservation, 25, 51-57, http://www.sciencedirect.com/science/article/pii/S1617138115000278