Kallimanis, A.S., Mazaris, A.D., Tsakanikas, D., Dimopoulos, P., Pantis, J.D., Sgardelis, S.P. (2012) Efficient biodiversity monitoring: Which taxonomic level to study?Ecological Indicators 15(1): 100-104. http://www.sciencedirect.com/science/article/pii/S1470160X11003116