Aebi A, Vaissière BE, van Engelsdorp D, Delaplane K, Roubik DW, Neumann P (2012) Back to the future: Apis vs. non-Apis pollination - a response to Ollerton et al. Trends in Ecology & Evolution 27 (3): 142-143. http://www.sciencedirect.com/science/article/pii/S0169534711003405